Change VideoRtpReceiver to create remote VideoTrack and VideoTrackSource.

webrtc/api/videotrack.cc

 /*
  *  Copyright 2011 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 32 matching lines @@
     rtc::VideoSinkInterface<cricket::VideoFrame>* sink,
     const rtc::VideoSinkWants& wants) {
   renderers_.AddOrUpdateSink(sink, wants);
 }
 
 void VideoTrack::RemoveSink(
     rtc::VideoSinkInterface<cricket::VideoFrame>* sink) {
   renderers_.RemoveSink(sink);
 }
 
-rtc::VideoSinkInterface<cricket::VideoFrame>* VideoTrack::GetSink() {
-  return &renderers_;
-}
-
 bool VideoTrack::set_enabled(bool enable) {
   renderers_.SetEnabled(enable);
   return MediaStreamTrack<VideoTrackInterface>::set_enabled(enable);
 }
 
 rtc::scoped_refptr<VideoTrack> VideoTrack::Create(
     const std::string& id,
     VideoTrackSourceInterface* source) {
   rtc::RefCountedObject<VideoTrack>* track =
       new rtc::RefCountedObject<VideoTrack>(id, source);
   return track;
 }
 
 }  // namespace webrtc