Cast: Restructure RTCP interface to better fit our usage.

media/cast/video_receiver/video_receiver.h

Index: media/cast/video_receiver/video_receiver.h
diff --git a/media/cast/video_receiver/video_receiver.h b/media/cast/video_receiver/video_receiver.h
index d69150893181660fa9d0a2858868928872f140fc..07454ef35416ea091e68e2fd64b96b0b0ca58510 100644
--- a/media/cast/video_receiver/video_receiver.h
+++ b/media/cast/video_receiver/video_receiver.h
@@ -99,7 +99,6 @@ class VideoReceiver : public base::NonThreadSafe,
   scoped_refptr<CastEnvironment> cast_environment_;
   scoped_ptr<Framer> framer_;
   const VideoCodec codec_;
-  const uint32 incoming_ssrc_;
   base::TimeDelta target_delay_delta_;
   base::TimeDelta frame_delay_;
   scoped_ptr<LocalRtpVideoData> incoming_payload_callback_;