Revert "Revert "Revert "Add ProtectionBitrateCalculator as an abstract class. ProtectionBitrateCalculatorDefault implements ProtectionBitrateCalculator. Register VideoSendStream to packet feedback"""

This reverts commit 718d8631b0294a8bdc56366b68c51e2f04cd0c9e.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Revert "Revert "Add ProtectionBitrateCalculator as an abstract class. ProtectionBitrateCalculatorDefault implements ProtectionBitrateCalculator. Register VideoSendStream to packet feedback""
> 
> This reverts commit 53d901332c2eb43cad0da5768c6f7a8c4aeb9590.
> 
> Reason for revert: root cause has been found and will be addressed in the patch.The root cause was protection_bitrate_calculator_ is now destructed before worker_queue_, and worker_queue_ may contain tasks which involves protection_bitrate_calculator_, so they need to be destructed in the opposite order.
> That was not an issue since before this cl we didn't allocate protection_bitrate_calculator_ on the heap.
> 
> Original change's description:
> > Revert "Add ProtectionBitrateCalculator as an abstract class. ProtectionBitrateCalculatorDefault implements ProtectionBitrateCalculator. Register VideoSendStream to packet feedback"
> >
> > This reverts commit e58e91b6d143ef847f8df24b19de4ba98cdb6f72.
> >
> > Reason for revert: Breaks downstream project b/70848177
> >
> > Original change's description:
> > > Add ProtectionBitrateCalculator as an abstract class. ProtectionBitrateCalculatorDefault implements ProtectionBitrateCalculator. Register VideoSendStream to packet feedback
> > >
> > > Bug: webrtc:8656
> > > Change-Id: Iab4f6ab8997cb082762218afc8580e9985ac2522
> > > Reviewed-on: https://webrtc-review.googlesource.com/33010
> > > Commit-Queue: Ying Wang <yinwa@webrtc.org>
> > > Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> > > Cr-Commit-Position: refs/heads/master@{#21348}
> >
> > TBR=stefan@webrtc.org,philipel@webrtc.org,yinwa@webrtc.org
> >
> > Change-Id: Ic186ba78be429bd1046ceac15051a3382b6ffc4f
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: webrtc:8656
> > Reviewed-on: https://webrtc-review.googlesource.com/35080
> > Commit-Queue: Lu Liu <lliuu@webrtc.org>
> > Reviewed-by: Lu Liu <lliuu@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#21374}
> 
> TBR=stefan@webrtc.org,philipel@webrtc.org,lliuu@webrtc.org,yujo@chromium.org,yinwa@webrtc.org
> 
> Change-Id: Ie2b5a2a2ead0f20ac67c1ea9b8d192af66bddf8d
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:8656
> Reviewed-on: https://webrtc-review.googlesource.com/35320
> Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> Reviewed-by: Ying Wang <yinwa@webrtc.org>
> Commit-Queue: Ying Wang <yinwa@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21409}

TBR=stefan@webrtc.org,philipel@webrtc.org,lliuu@webrtc.org,yujo@chromium.org,yinwa@webrtc.org

Change-Id: I9773aaa942054dcfbab6002a5d713ab3526b0534
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8656
Reviewed-on: https://webrtc-review.googlesource.com/35700
Reviewed-by: Ying Wang <yinwa@webrtc.org>
Commit-Queue: Ying Wang <yinwa@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21410}
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index 71e9333..59e8eb9 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -57,9 +57,8 @@
     "packet.h",
     "packet_buffer.cc",
     "packet_buffer.h",
+    "protection_bitrate_calculator.cc",
     "protection_bitrate_calculator.h",
-    "protection_bitrate_calculator_default.cc",
-    "protection_bitrate_calculator_default.h",
     "qp_parser.cc",
     "qp_parser.h",
     "receiver.cc",
diff --git a/modules/video_coding/protection_bitrate_calculator_default.cc b/modules/video_coding/protection_bitrate_calculator.cc
similarity index 89%
rename from modules/video_coding/protection_bitrate_calculator_default.cc
rename to modules/video_coding/protection_bitrate_calculator.cc
index f0db4c2..3c1da23 100644
--- a/modules/video_coding/protection_bitrate_calculator_default.cc
+++ b/modules/video_coding/protection_bitrate_calculator.cc
@@ -8,13 +8,13 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "modules/video_coding/protection_bitrate_calculator_default.h"
+#include "modules/video_coding/protection_bitrate_calculator.h"
 
 namespace webrtc {
 
 using rtc::CritScope;
 
-ProtectionBitrateCalculatorDefault::ProtectionBitrateCalculatorDefault(
+ProtectionBitrateCalculator::ProtectionBitrateCalculator(
     Clock* clock,
     VCMProtectionCallback* protection_callback)
     : clock_(clock),
@@ -23,22 +23,21 @@
           clock_->TimeInMilliseconds())),
       max_payload_size_(1460) {}
 
-ProtectionBitrateCalculatorDefault::~ProtectionBitrateCalculatorDefault(void) {
+ProtectionBitrateCalculator::~ProtectionBitrateCalculator(void) {
   loss_prot_logic_->Release();
 }
 
-void ProtectionBitrateCalculatorDefault::SetEncodingData(
-    size_t width,
-    size_t height,
-    size_t num_temporal_layers,
-    size_t max_payload_size) {
+void ProtectionBitrateCalculator::SetEncodingData(size_t width,
+                                                  size_t height,
+                                                  size_t num_temporal_layers,
+                                                  size_t max_payload_size) {
   CritScope lock(&crit_sect_);
   loss_prot_logic_->UpdateFrameSize(width, height);
   loss_prot_logic_->UpdateNumLayers(num_temporal_layers);
   max_payload_size_ = max_payload_size;
 }
 
-uint32_t ProtectionBitrateCalculatorDefault::SetTargetRates(
+uint32_t ProtectionBitrateCalculator::SetTargetRates(
     uint32_t estimated_bitrate_bps,
     int actual_framerate_fps,
     uint8_t fraction_lost,
@@ -139,8 +138,8 @@
   return estimated_bitrate_bps * (1.0 - protection_overhead_rate);
 }
 
-void ProtectionBitrateCalculatorDefault::SetProtectionMethod(bool enable_fec,
-                                                             bool enable_nack) {
+void ProtectionBitrateCalculator::SetProtectionMethod(bool enable_fec,
+                                                      bool enable_nack) {
   media_optimization::VCMProtectionMethodEnum method(media_optimization::kNone);
   if (enable_fec && enable_nack) {
     method = media_optimization::kNackFec;
@@ -153,7 +152,7 @@
   loss_prot_logic_->SetMethod(method);
 }
 
-void ProtectionBitrateCalculatorDefault::UpdateWithEncodedData(
+void ProtectionBitrateCalculator::UpdateWithEncodedData(
     const EncodedImage& encoded_image) {
   const size_t encoded_length = encoded_image._length;
   CritScope lock(&crit_sect_);
diff --git a/modules/video_coding/protection_bitrate_calculator.h b/modules/video_coding/protection_bitrate_calculator.h
index a309ec4..bf50589 100644
--- a/modules/video_coding/protection_bitrate_calculator.h
+++ b/modules/video_coding/protection_bitrate_calculator.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -13,7 +13,6 @@
 
 #include <list>
 #include <memory>
-#include <vector>
 
 #include "modules/include/module_common_types.h"
 #include "modules/video_coding/include/video_coding.h"
@@ -23,38 +22,57 @@
 
 namespace webrtc {
 
+// ProtectionBitrateCalculator calculates how much of the allocated network
+// capacity that can be used by an encoder and how much that
+// is needed for redundant packets such as FEC and NACK. It uses an
+// implementation of |VCMProtectionCallback| to set new FEC parameters and get
+// the bitrate currently used for FEC and NACK.
+// Usage:
+// Setup by calling SetProtectionMethod and SetEncodingData.
+// For each encoded image, call UpdateWithEncodedData.
+// Each time the bandwidth estimate change, call SetTargetRates. SetTargetRates
+// will return the bitrate that can be used by an encoder.
+// A lock is used to protect internal states, so methods can be called on an
+// arbitrary thread.
 class ProtectionBitrateCalculator {
  public:
-  virtual ~ProtectionBitrateCalculator() {}
+  ProtectionBitrateCalculator(Clock* clock,
+                              VCMProtectionCallback* protection_callback);
+  ~ProtectionBitrateCalculator();
 
-  virtual void SetProtectionMethod(bool enable_fec, bool enable_nack) = 0;
+  void SetProtectionMethod(bool enable_fec, bool enable_nack);
 
   // Informs media optimization of initial encoding state.
-  virtual void SetEncodingData(size_t width,
-                               size_t height,
-                               size_t num_temporal_layers,
-                               size_t max_payload_size) = 0;
+  void SetEncodingData(size_t width,
+                       size_t height,
+                       size_t num_temporal_layers,
+                       size_t max_payload_size);
 
   // Returns target rate for the encoder given the channel parameters.
   // Inputs:  estimated_bitrate_bps - the estimated network bitrate in bits/s.
   //          actual_framerate - encoder frame rate.
   //          fraction_lost - packet loss rate in % in the network.
   //          round_trip_time_ms - round trip time in milliseconds.
-  virtual uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
-                                  int actual_framerate,
-                                  uint8_t fraction_lost,
-                                  int64_t round_trip_time_ms) = 0;
-
-  virtual uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
-                                  std::vector<uint8_t> loss_mask_vector,
-                                  int64_t round_trip_time_ms) = 0;
-
+  uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
+                          int actual_framerate,
+                          uint8_t fraction_lost,
+                          int64_t round_trip_time_ms);
   // Informs of encoded output.
-  virtual void UpdateWithEncodedData(const EncodedImage& encoded_image) = 0;
+  void UpdateWithEncodedData(const EncodedImage& encoded_image);
 
-  virtual void OnLossMaskVector(const std::vector<bool> loss_mask_vector) = 0;
+ private:
+  enum { kBitrateAverageWinMs = 1000 };
+
+  Clock* const clock_;
+  VCMProtectionCallback* const protection_callback_;
+
+  rtc::CriticalSection crit_sect_;
+  std::unique_ptr<media_optimization::VCMLossProtectionLogic> loss_prot_logic_
+      RTC_GUARDED_BY(crit_sect_);
+  size_t max_payload_size_ RTC_GUARDED_BY(crit_sect_);
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(ProtectionBitrateCalculator);
 };
 
 }  // namespace webrtc
-
 #endif  // MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_H_
diff --git a/modules/video_coding/protection_bitrate_calculator_default.h b/modules/video_coding/protection_bitrate_calculator_default.h
deleted file mode 100644
index 19fa7e1..0000000
--- a/modules/video_coding/protection_bitrate_calculator_default.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_DEFAULT_H_
-#define MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_DEFAULT_H_
-
-#include <list>
-#include <memory>
-#include <vector>
-
-#include "modules/include/module_common_types.h"
-#include "modules/video_coding/include/video_coding.h"
-#include "modules/video_coding/media_opt_util.h"
-#include "modules/video_coding/protection_bitrate_calculator.h"
-#include "rtc_base/criticalsection.h"
-#include "system_wrappers/include/clock.h"
-
-namespace webrtc {
-
-// ProtectionBitrateCalculator calculates how much of the allocated network
-// capacity that can be used by an encoder and how much that
-// is needed for redundant packets such as FEC and NACK. It uses an
-// implementation of |VCMProtectionCallback| to set new FEC parameters and get
-// the bitrate currently used for FEC and NACK.
-// Usage:
-// Setup by calling SetProtectionMethod and SetEncodingData.
-// For each encoded image, call UpdateWithEncodedData.
-// Each time the bandwidth estimate change, call SetTargetRates. SetTargetRates
-// will return the bitrate that can be used by an encoder.
-// A lock is used to protect internal states, so methods can be called on an
-// arbitrary thread.
-class ProtectionBitrateCalculatorDefault : public ProtectionBitrateCalculator {
- public:
-  ProtectionBitrateCalculatorDefault(
-      Clock* clock,
-      VCMProtectionCallback* protection_callback);
-  ~ProtectionBitrateCalculatorDefault();
-
-  void SetProtectionMethod(bool enable_fec, bool enable_nack) override;
-
-  // Informs media optimization of initial encoding state.
-  void SetEncodingData(size_t width,
-                       size_t height,
-                       size_t num_temporal_layers,
-                       size_t max_payload_size) override;
-
-  uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
-                          std::vector<uint8_t> loss_mask_vector,
-                          int64_t round_trip_time_ms) override {
-    return 0;
-  }
-
-  void OnLossMaskVector(const std::vector<bool> loss_mask_vector) override {}
-
-  // Returns target rate for the encoder given the channel parameters.
-  // Inputs:  estimated_bitrate_bps - the estimated network bitrate in bits/s.
-  //          actual_framerate - encoder frame rate.
-  //          fraction_lost - packet loss rate in % in the network.
-  //          round_trip_time_ms - round trip time in milliseconds.
-  uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
-                          int actual_framerate,
-                          uint8_t fraction_lost,
-                          int64_t round_trip_time_ms) override;
-  // Informs of encoded output.
-  void UpdateWithEncodedData(const EncodedImage& encoded_image) override;
-
- private:
-  enum { kBitrateAverageWinMs = 1000 };
-  Clock* const clock_;
-  VCMProtectionCallback* const protection_callback_;
-  rtc::CriticalSection crit_sect_;
-  std::unique_ptr<media_optimization::VCMLossProtectionLogic> loss_prot_logic_
-      RTC_GUARDED_BY(crit_sect_);
-  size_t max_payload_size_ RTC_GUARDED_BY(crit_sect_);
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(ProtectionBitrateCalculatorDefault);
-};
-
-}  // namespace webrtc
-#endif  // MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_DEFAULT_H_
diff --git a/modules/video_coding/protection_bitrate_calculator_unittest.cc b/modules/video_coding/protection_bitrate_calculator_unittest.cc
index dd58bc2..66e2fa6 100644
--- a/modules/video_coding/protection_bitrate_calculator_unittest.cc
+++ b/modules/video_coding/protection_bitrate_calculator_unittest.cc
@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "modules/video_coding/protection_bitrate_calculator_default.h"
+#include "modules/video_coding/protection_bitrate_calculator.h"
 #include "system_wrappers/include/clock.h"
 #include "test/gtest.h"
 
@@ -46,7 +46,7 @@
 
   SimulatedClock clock_;
   ProtectionCallback protection_callback_;
-  ProtectionBitrateCalculatorDefault media_opt_;
+  ProtectionBitrateCalculator media_opt_;
 };
 
 TEST_F(ProtectionBitrateCalculatorTest, ProtectsUsingFecBitrate) {