Make VideoReceiveStream not inherit from I420FrameCallback.

webrtc/video/video_receive_stream.h

Index: webrtc/video/video_receive_stream.h
diff --git a/webrtc/video/video_receive_stream.h b/webrtc/video/video_receive_stream.h
index 0ea5385b319cc2a662ee3656c812f11aeb3dc51c..f531a3213fda3b853b584393f28cf66ba7ea7f50 100644
--- a/webrtc/video/video_receive_stream.h
+++ b/webrtc/video/video_receive_stream.h
@@ -38,7 +38,6 @@ class VieRemb;
 namespace internal {
 
 class VideoReceiveStream : public webrtc::VideoReceiveStream,
-                           public I420FrameCallback,
                            public rtc::VideoSinkInterface<VideoFrame>,
                            public EncodedImageCallback,
                            public NackSender,
@@ -65,9 +64,6 @@ class VideoReceiveStream : public webrtc::VideoReceiveStream,
 
   webrtc::VideoReceiveStream::Stats GetStats() const override;
 
-  // Overrides I420FrameCallback.
-  void FrameCallback(VideoFrame* video_frame) override;
-
   // Overrides rtc::VideoSinkInterface<VideoFrame>.
   void OnFrame(const VideoFrame& video_frame) override;