Revert "Add Timestamp accessor methods to the EncodedImage class."

This reverts commit f34d467b03da4f20a1d036a20966fcad43d2433f.

Reason for revert: Seems to break downstream project.

Original change's description:
> Add Timestamp accessor methods to the EncodedImage class.
> 
> Bug: webrtc:9378
> Change-Id: I59bf14f631f92f0f4e05f60d4af25641a23a53f9
> Reviewed-on: https://webrtc-review.googlesource.com/82100
> Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> Reviewed-by: Philip Eliasson <philipel@webrtc.org>
> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
> Commit-Queue: Niels Moller <nisse@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#23734}

TBR=brandtr@webrtc.org,nisse@webrtc.org,stefan@webrtc.org,philipel@webrtc.org

Change-Id: I3aa0c0119426886bc583c918aae862eb7f4b6b63
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9378
Reviewed-on: https://webrtc-review.googlesource.com/85600
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23739}
diff --git a/modules/video_coding/jitter_buffer.cc b/modules/video_coding/jitter_buffer.cc
index 0699e3b..5f45ece 100644
--- a/modules/video_coding/jitter_buffer.cc
+++ b/modules/video_coding/jitter_buffer.cc
@@ -54,7 +54,7 @@
 }
 
 void FrameList::InsertFrame(VCMFrameBuffer* frame) {
-  insert(rbegin().base(), FrameListPair(frame->Timestamp(), frame));
+  insert(rbegin().base(), FrameListPair(frame->TimeStamp(), frame));
 }
 
 VCMFrameBuffer* FrameList::PopFrame(uint32_t timestamp) {
@@ -110,7 +110,7 @@
     }
     free_frames->push_back(oldest_frame);
     TRACE_EVENT_INSTANT1("webrtc", "JB::OldOrEmptyFrameDropped", "timestamp",
-                         oldest_frame->Timestamp());
+                         oldest_frame->TimeStamp());
     erase(begin());
   }
 }
@@ -206,7 +206,7 @@
       continue;
     }
     SsMap::iterator ss_it;
-    if (Find(frame_it.second->Timestamp(), &ss_it)) {
+    if (Find(frame_it.second->TimeStamp(), &ss_it)) {
       if (gof_idx >= ss_it->second.num_frames_in_gof) {
         continue;  // Assume corresponding SS not yet received.
       }
@@ -522,7 +522,7 @@
     }
   }
 
-  *timestamp = oldest_frame->Timestamp();
+  *timestamp = oldest_frame->TimeStamp();
   return true;
 }
 
@@ -558,7 +558,7 @@
       // Wait for this one to get complete.
       waiting_for_completion_.frame_size = frame->Length();
       waiting_for_completion_.latest_packet_time = frame->LatestPacketTimeMs();
-      waiting_for_completion_.timestamp = frame->Timestamp();
+      waiting_for_completion_.timestamp = frame->TimeStamp();
     }
   }
 
@@ -709,8 +709,8 @@
       frame->InsertPacket(packet, now_ms, decode_error_mode_, frame_data);
 
   if (previous_state != kStateComplete) {
-    TRACE_EVENT_ASYNC_BEGIN1("webrtc", "Video", frame->Timestamp(), "timestamp",
-                             frame->Timestamp());
+    TRACE_EVENT_ASYNC_BEGIN1("webrtc", "Video", frame->TimeStamp(), "timestamp",
+                             frame->TimeStamp());
   }
 
   if (buffer_state > 0) {
@@ -825,7 +825,7 @@
   for (FrameList::const_iterator it = decodable_frames_.begin();
        it != decodable_frames_.end(); ++it) {
     VCMFrameBuffer* decodable_frame = it->second;
-    if (IsNewerTimestamp(decodable_frame->Timestamp(), frame.Timestamp())) {
+    if (IsNewerTimestamp(decodable_frame->TimeStamp(), frame.TimeStamp())) {
       break;
     }
     decoding_state.SetState(decodable_frame);
@@ -859,7 +859,7 @@
        it != incomplete_frames_.end();) {
     VCMFrameBuffer* frame = it->second;
     if (IsNewerTimestamp(original_decoded_state.time_stamp(),
-                         frame->Timestamp())) {
+                         frame->TimeStamp())) {
       ++it;
       continue;
     }
@@ -941,11 +941,11 @@
   if (incomplete_frames_.empty()) {
     return 0;
   }
-  uint32_t start_timestamp = incomplete_frames_.Front()->Timestamp();
+  uint32_t start_timestamp = incomplete_frames_.Front()->TimeStamp();
   if (!decodable_frames_.empty()) {
-    start_timestamp = decodable_frames_.Back()->Timestamp();
+    start_timestamp = decodable_frames_.Back()->TimeStamp();
   }
-  return incomplete_frames_.Back()->Timestamp() - start_timestamp;
+  return incomplete_frames_.Back()->TimeStamp() - start_timestamp;
 }
 
 uint16_t VCMJitterBuffer::EstimatedLowSequenceNumber(
@@ -1178,10 +1178,10 @@
   incoming_frame_count_++;
 
   if (frame.FrameType() == kVideoFrameKey) {
-    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.Timestamp(),
+    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.TimeStamp(),
                             "KeyComplete");
   } else {
-    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.Timestamp(),
+    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.TimeStamp(),
                             "DeltaComplete");
   }
 
@@ -1257,7 +1257,7 @@
   }
   // No retransmitted frames should be a part of the jitter
   // estimate.
-  UpdateJitterEstimate(frame.LatestPacketTimeMs(), frame.Timestamp(),
+  UpdateJitterEstimate(frame.LatestPacketTimeMs(), frame.TimeStamp(),
                        frame.Length(), incomplete_frame);
 }