Change VideoRtpReceiver to create remote VideoTrack and VideoTrackSource.

webrtc/api/mediastreaminterface.h

 /*
  *  Copyright 2012 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.
  */
 
@@ skipping 159 matching lines @@
   }
 
   // Register a video sink for this track.
   void AddOrUpdateSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink,
                        const rtc::VideoSinkWants& wants) override{};
   void RemoveSink(
       rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override{};
 
   virtual VideoTrackSourceInterface* GetSource() const = 0;
 
-  // Return the track input sink. I.e., frames sent to this sink are
-  // propagated to all renderers registered with the track. The
-  // returned sink must not change between calls. Currently, this
-  // method is used for remote tracks (VideoRtpReceiver); further
-  // refactoring is planned for this path, it's unclear if this method
-  // belongs here long term.
-
-  // We do this instead of simply implementing the
-  // VideoSourceInterface directly, because if we did the latter, we'd
-  // need an OnFrame method in VideoTrackProxy, with a thread jump on
-  // each call.
-
-  // TODO(nisse): It has a default implementation so that mock
-  // objects, in particular, chrome's MockWebRtcVideoTrack, doesn't
-  // need to know about it. Consider removing the implementation (or
-  // this comment) after refactoring dust settles.
-  virtual rtc::VideoSinkInterface<cricket::VideoFrame>* GetSink() {
-    return nullptr;
-  };
-
  protected:
   virtual ~VideoTrackInterface() {}
 };
 
 // Interface for receiving audio data from a AudioTrack.
 class AudioTrackSinkInterface {
  public:
   virtual void OnData(const void* audio_data,
                       int bits_per_sample,
                       int sample_rate,
@@ skipping 107 matching lines @@
   virtual bool RemoveTrack(AudioTrackInterface* track) = 0;
   virtual bool RemoveTrack(VideoTrackInterface* track) = 0;
 
  protected:
   virtual ~MediaStreamInterface() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_MEDIASTREAMINTERFACE_H_