Change VideoRtpReceiver to create remote VideoTrack and VideoTrackSource.

webrtc/api/videotrack.cc

Index: webrtc/api/videotrack.cc
diff --git a/webrtc/api/videotrack.cc b/webrtc/api/videotrack.cc
index 36d256f1e416d71499ee19f1f6895c9ef8722009..b2ea1f9dc2c69bdba20021c590ed216196b392a6 100644
--- a/webrtc/api/videotrack.cc
+++ b/webrtc/api/videotrack.cc
@@ -50,10 +50,6 @@ void VideoTrack::RemoveSink(
   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);