Revert of RTCOutboundRTPStreamStats added. (patchset #3 id:80001 of https://codereview.webrtc.org/2456463002/ )

Reason for revert:
Breaks Chrome FYI.
peerconnection_unittest calls RTCStatsReport::Create without  parameters.

Original issue's description:
> RTCOutboundRTPStreamStats[1] added.
>
> This also adds RTCRTPStreamStats[2] which it derives from. Not all stats
> are supported in this CL, this must be addressed before closing the
> issue.
>
> RTCStatsReport also gets a timestamp and ToString.
>
> [1] https://w3c.github.io/webrtc-stats/#outboundrtpstats-dict*
> [2] https://w3c.github.io/webrtc-stats/#streamstats-dict*
>
> BUG=chromium:627816, chromium:657856, chromium:657854
>
> Committed: https://crrev.com/69e9cb08285f6cbcab547c7a5e6aa668fa6f2d29
> Cr-Commit-Position: refs/heads/master@{#14860}

TBR=hta@webrtc.org,deadbeef@webrtc.org,hbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:627816, chromium:657856, chromium:657854

Review-Url: https://codereview.webrtc.org/2465223002
Cr-Commit-Position: refs/heads/master@{#14863}
diff --git a/webrtc/api/rtcstatscollector.cc b/webrtc/api/rtcstatscollector.cc
index 543181e..dc2b189 100644
--- a/webrtc/api/rtcstatscollector.cc
+++ b/webrtc/api/rtcstatscollector.cc
@@ -17,8 +17,6 @@
 #include "webrtc/api/peerconnection.h"
 #include "webrtc/api/webrtcsession.h"
 #include "webrtc/base/checks.h"
-#include "webrtc/base/timeutils.h"
-#include "webrtc/media/base/mediachannel.h"
 #include "webrtc/p2p/base/candidate.h"
 #include "webrtc/p2p/base/p2pconstants.h"
 #include "webrtc/p2p/base/port.h"
@@ -43,21 +41,6 @@
       rtc::ToString<>(channel_component);
 }
 
-std::string RTCTransportStatsIDFromBaseChannel(
-    const ProxyTransportMap& proxy_to_transport,
-    const cricket::BaseChannel& base_channel) {
-  auto proxy_it = proxy_to_transport.find(base_channel.content_name());
-  if (proxy_it == proxy_to_transport.cend())
-    return "";
-  return RTCTransportStatsIDFromTransportChannel(
-      proxy_it->second, cricket::ICE_CANDIDATE_COMPONENT_RTP);
-}
-
-std::string RTCOutboundRTPStreamStatsIDFromSSRC(bool audio, uint32_t ssrc) {
-  return audio ? "RTCOutboundRTPAudioStream_" + rtc::ToString<>(ssrc)
-               : "RTCOutboundRTPVideoStream_" + rtc::ToString<>(ssrc);
-}
-
 const char* CandidateTypeToRTCIceCandidateType(const std::string& type) {
   if (type == cricket::LOCAL_PORT_TYPE)
     return RTCIceCandidateType::kHost;
@@ -88,47 +71,6 @@
   }
 }
 
-void SetOutboundRTPStreamStatsFromMediaSenderInfo(
-    const cricket::MediaSenderInfo& media_sender_info,
-    RTCOutboundRTPStreamStats* outbound_stats) {
-  RTC_DCHECK(outbound_stats);
-  outbound_stats->ssrc = rtc::ToString<>(media_sender_info.ssrc());
-  // TODO(hbos): Support the remote case. crbug.com/657856
-  outbound_stats->is_remote = false;
-  // TODO(hbos): Set |codec_id| when we have |RTCCodecStats|. Maybe relevant:
-  // |media_sender_info.codec_name|. crbug.com/657854, 657856, 659117
-  outbound_stats->packets_sent =
-      static_cast<uint32_t>(media_sender_info.packets_sent);
-  outbound_stats->bytes_sent =
-      static_cast<uint64_t>(media_sender_info.bytes_sent);
-  outbound_stats->round_trip_time =
-      static_cast<double>(media_sender_info.rtt_ms) / rtc::kNumMillisecsPerSec;
-}
-
-void SetOutboundRTPStreamStatsFromVoiceSenderInfo(
-    const cricket::VoiceSenderInfo& voice_sender_info,
-    RTCOutboundRTPStreamStats* outbound_audio) {
-  SetOutboundRTPStreamStatsFromMediaSenderInfo(
-      voice_sender_info, outbound_audio);
-  outbound_audio->media_type = "audio";
-  // |fir_count|, |pli_count| and |sli_count| are only valid for video and are
-  // purposefully left undefined for audio.
-}
-
-void SetOutboundRTPStreamStatsFromVideoSenderInfo(
-    const cricket::VideoSenderInfo& video_sender_info,
-    RTCOutboundRTPStreamStats* outbound_video) {
-  SetOutboundRTPStreamStatsFromMediaSenderInfo(
-      video_sender_info, outbound_video);
-  outbound_video->media_type = "video";
-  outbound_video->fir_count =
-      static_cast<uint32_t>(video_sender_info.firs_rcvd);
-  outbound_video->pli_count =
-      static_cast<uint32_t>(video_sender_info.plis_rcvd);
-  outbound_video->nack_count =
-      static_cast<uint32_t>(video_sender_info.nacks_rcvd);
-}
-
 void ProduceCertificateStatsFromSSLCertificateStats(
     int64_t timestamp_us, const rtc::SSLCertificateStats& certificate_stats,
     RTCStatsReport* report) {
@@ -242,8 +184,7 @@
 void RTCStatsCollector::ProducePartialResultsOnSignalingThread(
     int64_t timestamp_us) {
   RTC_DCHECK(signaling_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(
-      timestamp_us);
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
 
   SessionStats session_stats;
   if (pc_->session()->GetTransportStats(&session_stats)) {
@@ -254,8 +195,6 @@
         timestamp_us, transport_cert_stats, report.get());
     ProduceIceCandidateAndPairStats_s(
         timestamp_us, session_stats, report.get());
-    ProduceRTPStreamStats_s(
-        timestamp_us, session_stats, report.get());
     ProduceTransportStats_s(
         timestamp_us, session_stats, transport_cert_stats, report.get());
   }
@@ -268,16 +207,9 @@
 void RTCStatsCollector::ProducePartialResultsOnWorkerThread(
     int64_t timestamp_us) {
   RTC_DCHECK(worker_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(
-      timestamp_us);
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
 
   // TODO(hbos): Gather stats on worker thread.
-  // pc_->session()'s channels are owned by the signaling thread but there are
-  // some stats that are gathered on the worker thread. Instead of a synchronous
-  // invoke on "s->w" we could to the "w" work here asynchronously if it wasn't
-  // for the ownership issue. Synchronous invokes in other places makes it
-  // difficult to introduce locks without introducing deadlocks and the channels
-  // are not reference counted.
 
   AddPartialResults(report);
 }
@@ -285,16 +217,9 @@
 void RTCStatsCollector::ProducePartialResultsOnNetworkThread(
     int64_t timestamp_us) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(
-      timestamp_us);
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
 
   // TODO(hbos): Gather stats on network thread.
-  // pc_->session()'s channels are owned by the signaling thread but there are
-  // some stats that are gathered on the network thread. Instead of a
-  // synchronous invoke on "s->n" we could to the "n" work here asynchronously
-  // if it wasn't for the ownership issue. Synchronous invokes in other places
-  // makes it difficult to introduce locks without introducing deadlocks and the
-  // channels are not reference counted.
 
   AddPartialResults(report);
 }
@@ -412,7 +337,7 @@
         // smoothed according to the spec. crbug.com/633550. See
         // https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatepairstats-currentrtt
         candidate_pair_stats->current_rtt =
-            static_cast<double>(info.rtt) / rtc::kNumMillisecsPerSec;
+            static_cast<double>(info.rtt) / 1000.0;
         candidate_pair_stats->requests_sent =
             static_cast<uint64_t>(info.sent_ping_requests_total);
         candidate_pair_stats->responses_received =
@@ -449,63 +374,6 @@
   report->AddStats(std::move(stats));
 }
 
-void RTCStatsCollector::ProduceRTPStreamStats_s(
-    int64_t timestamp_us, const SessionStats& session_stats,
-    RTCStatsReport* report) const {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-
-  // Audio
-  if (pc_->session()->voice_channel()) {
-    cricket::VoiceMediaInfo voice_media_info;
-    if (pc_->session()->voice_channel()->GetStats(&voice_media_info)) {
-      std::string transport_id = RTCTransportStatsIDFromBaseChannel(
-          session_stats.proxy_to_transport, *pc_->session()->voice_channel());
-      for (const cricket::VoiceSenderInfo& voice_sender_info :
-           voice_media_info.senders) {
-        // TODO(nisse): SSRC == 0 currently means none. Delete check when that
-        // is fixed.
-        if (voice_sender_info.ssrc() == 0)
-          continue;
-        std::unique_ptr<RTCOutboundRTPStreamStats> outbound_audio(
-            new RTCOutboundRTPStreamStats(
-                RTCOutboundRTPStreamStatsIDFromSSRC(
-                    true, voice_sender_info.ssrc()),
-                timestamp_us));
-        SetOutboundRTPStreamStatsFromVoiceSenderInfo(
-            voice_sender_info, outbound_audio.get());
-        if (!transport_id.empty())
-          outbound_audio->transport_id = transport_id;
-        report->AddStats(std::move(outbound_audio));
-      }
-    }
-  }
-  // Video
-  if (pc_->session()->video_channel()) {
-    cricket::VideoMediaInfo video_media_info;
-    if (pc_->session()->video_channel()->GetStats(&video_media_info)) {
-      std::string transport_id = RTCTransportStatsIDFromBaseChannel(
-          session_stats.proxy_to_transport, *pc_->session()->video_channel());
-      for (const cricket::VideoSenderInfo& video_sender_info :
-           video_media_info.senders) {
-        // TODO(nisse): SSRC == 0 currently means none. Delete check when that
-        // is fixed.
-        if (video_sender_info.ssrc() == 0)
-          continue;
-        std::unique_ptr<RTCOutboundRTPStreamStats> outbound_video(
-            new RTCOutboundRTPStreamStats(
-                RTCOutboundRTPStreamStatsIDFromSSRC(
-                    false, video_sender_info.ssrc()),
-                timestamp_us));
-        SetOutboundRTPStreamStatsFromVideoSenderInfo(
-            video_sender_info, outbound_video.get());
-        if (!transport_id.empty())
-          outbound_video->transport_id = transport_id;
-        report->AddStats(std::move(outbound_video));
-      }
-    }
-  }
-}
-
 void RTCStatsCollector::ProduceTransportStats_s(
     int64_t timestamp_us, const SessionStats& session_stats,
     const std::map<std::string, CertificateStatsPair>& transport_cert_stats,
diff --git a/webrtc/api/rtcstatscollector.h b/webrtc/api/rtcstatscollector.h
index fbef118..51d2705 100644
--- a/webrtc/api/rtcstatscollector.h
+++ b/webrtc/api/rtcstatscollector.h
@@ -101,12 +101,6 @@
   // Produces |RTCPeerConnectionStats|.
   void ProducePeerConnectionStats_s(
       int64_t timestamp_us, RTCStatsReport* report) const;
-  // Produces |RTCOutboundRTPStreamStats|. TODO(hbos): Produce both types of
-  // |RTCRTPStreamStats|, the other one being |RTCInboundRTPStreamStats|.
-  // crbug.com/657855
-  void ProduceRTPStreamStats_s(
-      int64_t timestamp_us, const SessionStats& session_stats,
-      RTCStatsReport* report) const;
   // Produces |RTCTransportStats|.
   void ProduceTransportStats_s(
       int64_t timestamp_us, const SessionStats& session_stats,
diff --git a/webrtc/api/rtcstatscollector_unittest.cc b/webrtc/api/rtcstatscollector_unittest.cc
index 312f0d2..97ede90 100644
--- a/webrtc/api/rtcstatscollector_unittest.cc
+++ b/webrtc/api/rtcstatscollector_unittest.cc
@@ -32,16 +32,13 @@
 #include "webrtc/base/timeutils.h"
 #include "webrtc/logging/rtc_event_log/rtc_event_log.h"
 #include "webrtc/media/base/fakemediaengine.h"
-#include "webrtc/media/base/test/mock_mediachannel.h"
 #include "webrtc/p2p/base/p2pconstants.h"
 #include "webrtc/p2p/base/port.h"
 
 using testing::_;
 using testing::Invoke;
 using testing::Return;
-using testing::ReturnNull;
 using testing::ReturnRef;
-using testing::SetArgPointee;
 
 namespace webrtc {
 
@@ -70,10 +67,6 @@
   *os << stats.ToString();
 }
 
-void PrintTo(const RTCOutboundRTPStreamStats& stats, ::std::ostream* os) {
-  *os << stats.ToString();
-}
-
 void PrintTo(const RTCTransportStats& stats, ::std::ostream* os) {
   *os << stats.ToString();
 }
@@ -151,9 +144,8 @@
   RTCStatsCollectorTestHelper()
       : worker_thread_(rtc::Thread::Current()),
         network_thread_(rtc::Thread::Current()),
-        media_engine_(new cricket::FakeMediaEngine()),
         channel_manager_(
-            new cricket::ChannelManager(media_engine_,
+            new cricket::ChannelManager(new cricket::FakeMediaEngine(),
                                         worker_thread_,
                                         network_thread_)),
         media_controller_(
@@ -167,8 +159,6 @@
     EXPECT_CALL(pc_, session()).WillRepeatedly(Return(&session_));
     EXPECT_CALL(pc_, sctp_data_channels()).WillRepeatedly(
         ReturnRef(data_channels_));
-    EXPECT_CALL(session_, video_channel()).WillRepeatedly(ReturnNull());
-    EXPECT_CALL(session_, voice_channel()).WillRepeatedly(ReturnNull());
     EXPECT_CALL(session_, GetTransportStats(_)).WillRepeatedly(Return(false));
     EXPECT_CALL(session_, GetLocalCertificate(_, _)).WillRepeatedly(
         Return(false));
@@ -177,9 +167,6 @@
   }
 
   rtc::ScopedFakeClock& fake_clock() { return fake_clock_; }
-  rtc::Thread* worker_thread() { return worker_thread_; }
-  rtc::Thread* network_thread() { return network_thread_; }
-  cricket::FakeMediaEngine* media_engine() { return media_engine_; }
   MockWebRtcSession& session() { return session_; }
   MockPeerConnection& pc() { return pc_; }
   std::vector<rtc::scoped_refptr<DataChannel>>& data_channels() {
@@ -197,7 +184,6 @@
   webrtc::RtcEventLogNullImpl event_log_;
   rtc::Thread* const worker_thread_;
   rtc::Thread* const network_thread_;
-  cricket::FakeMediaEngine* media_engine_;
   std::unique_ptr<cricket::ChannelManager> channel_manager_;
   std::unique_ptr<webrtc::MediaControllerInterface> media_controller_;
   MockWebRtcSession session_;
@@ -285,7 +271,7 @@
     }
 
     rtc::scoped_refptr<RTCStatsReport> signaling_report =
-        RTCStatsReport::Create(0);
+        RTCStatsReport::Create();
     signaling_report->AddStats(std::unique_ptr<const RTCStats>(
         new RTCTestStats("SignalingThreadStats", timestamp_us)));
     AddPartialResults(signaling_report);
@@ -298,8 +284,7 @@
       ++produced_on_worker_thread_;
     }
 
-    rtc::scoped_refptr<RTCStatsReport> worker_report =
-        RTCStatsReport::Create(0);
+    rtc::scoped_refptr<RTCStatsReport> worker_report = RTCStatsReport::Create();
     worker_report->AddStats(std::unique_ptr<const RTCStats>(
         new RTCTestStats("WorkerThreadStats", timestamp_us)));
     AddPartialResults(worker_report);
@@ -313,7 +298,7 @@
     }
 
     rtc::scoped_refptr<RTCStatsReport> network_report =
-        RTCStatsReport::Create(0);
+        RTCStatsReport::Create();
     network_report->AddStats(std::unique_ptr<const RTCStats>(
         new RTCTestStats("NetworkThreadStats", timestamp_us)));
     AddPartialResults(network_report);
@@ -975,130 +960,6 @@
   }
 }
 
-TEST_F(RTCStatsCollectorTest, CollectRTCOutboundRTPStreamStats_Audio) {
-  MockVoiceMediaChannel* voice_media_channel = new MockVoiceMediaChannel();
-  cricket::VoiceChannel voice_channel(
-      test_->worker_thread(), test_->network_thread(), test_->media_engine(),
-      voice_media_channel, nullptr, "VoiceContentName", false);
-
-  cricket::VoiceMediaInfo voice_media_info;
-  voice_media_info.senders.push_back(cricket::VoiceSenderInfo());
-  voice_media_info.senders[0].local_stats.push_back(cricket::SsrcSenderInfo());
-  voice_media_info.senders[0].local_stats[0].ssrc = 1;
-  voice_media_info.senders[0].packets_sent = 2;
-  voice_media_info.senders[0].bytes_sent = 3;
-  voice_media_info.senders[0].rtt_ms = 4500.0;
-  EXPECT_CALL(*voice_media_channel, GetStats(_))
-      .WillOnce(DoAll(SetArgPointee<0>(voice_media_info), Return(true)));
-
-  SessionStats session_stats;
-  session_stats.proxy_to_transport["VoiceContentName"] = "TransportName";
-  session_stats.transport_stats["TransportName"].transport_name =
-      "TransportName";
-
-  // Make sure the associated |RTCTransportStats| is created.
-  cricket::TransportChannelStats channel_stats;
-  channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
-  cricket::ConnectionInfo connection_info;
-  connection_info.local_candidate = *CreateFakeCandidate(
-      "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42).get();
-  connection_info.remote_candidate = *CreateFakeCandidate(
-      "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42).get();
-  channel_stats.connection_infos.push_back(connection_info);
-  session_stats.transport_stats["TransportName"].channel_stats.push_back(
-      channel_stats);
-
-  EXPECT_CALL(test_->session(), GetTransportStats(_))
-      .WillRepeatedly(DoAll(SetArgPointee<0>(session_stats), Return(true)));
-  EXPECT_CALL(test_->session(), voice_channel())
-      .WillRepeatedly(Return(&voice_channel));
-
-  rtc::scoped_refptr<const RTCStatsReport> report = GetStatsReport();
-
-  RTCOutboundRTPStreamStats expected_audio(
-      "RTCOutboundRTPAudioStream_1", report->timestamp_us());
-  expected_audio.ssrc = "1";
-  expected_audio.is_remote = false;
-  expected_audio.media_type = "audio";
-  expected_audio.transport_id = "RTCTransport_TransportName_" +
-      rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  expected_audio.packets_sent = 2;
-  expected_audio.bytes_sent = 3;
-  expected_audio.round_trip_time = 4.5;
-
-  ASSERT(report->Get(expected_audio.id()));
-  const RTCOutboundRTPStreamStats& audio = report->Get(
-      expected_audio.id())->cast_to<RTCOutboundRTPStreamStats>();
-  EXPECT_EQ(audio, expected_audio);
-
-  EXPECT_TRUE(report->Get(*expected_audio.transport_id));
-}
-
-TEST_F(RTCStatsCollectorTest, CollectRTCOutboundRTPStreamStats_Video) {
-  MockVideoMediaChannel* video_media_channel = new MockVideoMediaChannel();
-  cricket::VideoChannel video_channel(
-      test_->worker_thread(), test_->network_thread(), video_media_channel,
-      nullptr, "VideoContentName", false);
-
-  cricket::VideoMediaInfo video_media_info;
-  video_media_info.senders.push_back(cricket::VideoSenderInfo());
-  video_media_info.senders[0].local_stats.push_back(cricket::SsrcSenderInfo());
-  video_media_info.senders[0].local_stats[0].ssrc = 1;
-  video_media_info.senders[0].firs_rcvd = 2;
-  video_media_info.senders[0].plis_rcvd = 3;
-  video_media_info.senders[0].nacks_rcvd = 4;
-  video_media_info.senders[0].packets_sent = 5;
-  video_media_info.senders[0].bytes_sent = 6;
-  video_media_info.senders[0].rtt_ms = 7500.0;
-  EXPECT_CALL(*video_media_channel, GetStats(_))
-      .WillOnce(DoAll(SetArgPointee<0>(video_media_info), Return(true)));
-
-  SessionStats session_stats;
-  session_stats.proxy_to_transport["VideoContentName"] = "TransportName";
-  session_stats.transport_stats["TransportName"].transport_name =
-      "TransportName";
-
-  // Make sure the associated |RTCTransportStats| is created.
-  cricket::TransportChannelStats channel_stats;
-  channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
-  cricket::ConnectionInfo connection_info;
-  connection_info.local_candidate = *CreateFakeCandidate(
-      "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42).get();
-  connection_info.remote_candidate = *CreateFakeCandidate(
-      "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42).get();
-  channel_stats.connection_infos.push_back(connection_info);
-  session_stats.transport_stats["TransportName"].channel_stats.push_back(
-      channel_stats);
-
-  EXPECT_CALL(test_->session(), GetTransportStats(_))
-      .WillRepeatedly(DoAll(SetArgPointee<0>(session_stats), Return(true)));
-  EXPECT_CALL(test_->session(), video_channel())
-      .WillRepeatedly(Return(&video_channel));
-
-  rtc::scoped_refptr<const RTCStatsReport> report = GetStatsReport();
-
-  RTCOutboundRTPStreamStats expected_video(
-      "RTCOutboundRTPVideoStream_1", report->timestamp_us());
-  expected_video.ssrc = "1";
-  expected_video.is_remote = false;
-  expected_video.media_type = "video";
-  expected_video.transport_id = "RTCTransport_TransportName_" +
-      rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  expected_video.fir_count = 2;
-  expected_video.pli_count = 3;
-  expected_video.nack_count = 4;
-  expected_video.packets_sent = 5;
-  expected_video.bytes_sent = 6;
-  expected_video.round_trip_time = 7.5;
-
-  ASSERT(report->Get(expected_video.id()));
-  const RTCOutboundRTPStreamStats& video = report->Get(
-      expected_video.id())->cast_to<RTCOutboundRTPStreamStats>();
-  EXPECT_EQ(video, expected_video);
-
-  EXPECT_TRUE(report->Get(*expected_video.transport_id));
-}
-
 TEST_F(RTCStatsCollectorTest, CollectRTCTransportStats) {
   std::unique_ptr<cricket::Candidate> rtp_local_candidate = CreateFakeCandidate(
       "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42);
diff --git a/webrtc/api/stats/rtcstats.h b/webrtc/api/stats/rtcstats.h
index d23e928..0876080 100644
--- a/webrtc/api/stats/rtcstats.h
+++ b/webrtc/api/stats/rtcstats.h
@@ -71,8 +71,8 @@
   bool operator==(const RTCStats& other) const;
   bool operator!=(const RTCStats& other) const;
 
-  // Creates a human readable string representation of the stats object, listing
-  // all of its members (names and values).
+  // Creates a human readable string representation of the report, listing all
+  // of its members (names and values).
   std::string ToString() const;
 
   // Downcasts the stats object to an |RTCStats| subclass |T|. DCHECKs that the
diff --git a/webrtc/api/stats/rtcstats_objects.h b/webrtc/api/stats/rtcstats_objects.h
index 232e66b..3684e27 100644
--- a/webrtc/api/stats/rtcstats_objects.h
+++ b/webrtc/api/stats/rtcstats_objects.h
@@ -82,7 +82,7 @@
 
 // https://w3c.github.io/webrtc-stats/#candidatepair-dict*
 // TODO(hbos): Finish implementation. Tracking bug crbug.com/633550
-class RTCIceCandidatePairStats final : public RTCStats {
+class RTCIceCandidatePairStats : public RTCStats {
  public:
   WEBRTC_RTCSTATS_DECL();
 
@@ -202,62 +202,6 @@
   RTCStatsMember<uint32_t> data_channels_closed;
 };
 
-// https://w3c.github.io/webrtc-stats/#streamstats-dict*
-// TODO(hbos): Finish implementation. Tracking bug crbug.com/657854
-class RTCRTPStreamStats : public RTCStats {
- public:
-  WEBRTC_RTCSTATS_DECL();
-
-  RTCRTPStreamStats(const RTCRTPStreamStats& other);
-  ~RTCRTPStreamStats() override;
-
-  RTCStatsMember<std::string> ssrc;
-  // TODO(hbos): When the remote case is supported |RTCStatsCollector| needs to
-  // set this. crbug.com/657855, 657856
-  RTCStatsMember<std::string> associate_stats_id;
-  // TODO(hbos): Remote case not supported by |RTCStatsCollector|.
-  // crbug.com/657855, 657856
-  RTCStatsMember<bool> is_remote;  // = false
-  RTCStatsMember<std::string> media_type;
-  // TODO(hbos): Not collected by |RTCStatsCollector|. crbug.com/657854, 659137
-  RTCStatsMember<std::string> media_track_id;
-  RTCStatsMember<std::string> transport_id;
-  // TODO(hbos): Not collected by |RTCStatsCollector|. crbug.com/657854, 659117
-  RTCStatsMember<std::string> codec_id;
-  // FIR and PLI counts are only defined for |media_type == "video"|.
-  RTCStatsMember<uint32_t> fir_count;
-  RTCStatsMember<uint32_t> pli_count;
-  // TODO(hbos): NACK count should be collected by |RTCStatsCollector| for both
-  // audio and video but is only defined in the "video" case. crbug.com/657856
-  RTCStatsMember<uint32_t> nack_count;
-  // TODO(hbos): Not collected by |RTCStatsCollector|. crbug.com/657854
-  // SLI count is only defined for |media_type == "video"|.
-  RTCStatsMember<uint32_t> sli_count;
-
- protected:
-  RTCRTPStreamStats(const std::string& id, int64_t timestamp_us);
-  RTCRTPStreamStats(std::string&& id, int64_t timestamp_us);
-};
-
-// https://w3c.github.io/webrtc-stats/#outboundrtpstats-dict*
-// TODO(hbos): Finish implementation and support the remote case
-// |is_remote = true|. Tracking bug crbug.com/657856
-class RTCOutboundRTPStreamStats final : public RTCRTPStreamStats {
- public:
-  WEBRTC_RTCSTATS_DECL();
-
-  RTCOutboundRTPStreamStats(const std::string& id, int64_t timestamp_us);
-  RTCOutboundRTPStreamStats(std::string&& id, int64_t timestamp_us);
-  RTCOutboundRTPStreamStats(const RTCOutboundRTPStreamStats& other);
-  ~RTCOutboundRTPStreamStats() override;
-
-  RTCStatsMember<uint32_t> packets_sent;
-  RTCStatsMember<uint64_t> bytes_sent;
-  // TODO(hbos): Not collected by |RTCStatsCollector|. crbug.com/657856
-  RTCStatsMember<double> target_bitrate;
-  RTCStatsMember<double> round_trip_time;
-};
-
 // https://w3c.github.io/webrtc-stats/#transportstats-dict*
 class RTCTransportStats final : public RTCStats {
  public:
diff --git a/webrtc/api/stats/rtcstatsreport.h b/webrtc/api/stats/rtcstatsreport.h
index 34f0d54..beb8650 100644
--- a/webrtc/api/stats/rtcstatsreport.h
+++ b/webrtc/api/stats/rtcstatsreport.h
@@ -36,7 +36,6 @@
     ConstIterator& operator++();
     ConstIterator& operator++(int);
     const RTCStats& operator*() const;
-    const RTCStats* operator->() const;
     bool operator==(const ConstIterator& other) const;
     bool operator!=(const ConstIterator& other) const;
 
@@ -50,12 +49,11 @@
     StatsMap::const_iterator it_;
   };
 
-  static rtc::scoped_refptr<RTCStatsReport> Create(uint64_t timestamp_us);
+  static rtc::scoped_refptr<RTCStatsReport> Create();
 
-  explicit RTCStatsReport(uint64_t timestamp_us);
+  RTCStatsReport();
   RTCStatsReport(const RTCStatsReport& other) = delete;
 
-  uint64_t timestamp_us() const { return timestamp_us_; }
   bool AddStats(std::unique_ptr<const RTCStats> stats);
   const RTCStats* Get(const std::string& id) const;
   size_t size() const { return stats_.size(); }
@@ -79,16 +77,11 @@
     return stats_of_type;
   }
 
-  // Creates a human readable string representation of the report, listing all
-  // of its stats objects.
-  std::string ToString() const;
-
   friend class rtc::RefCountedObject<RTCStatsReport>;
 
  private:
   ~RTCStatsReport() override;
 
-  uint64_t timestamp_us_;
   StatsMap stats_;
 };