Replace VideoDecoder::media_format() with significantly simpler width()/height() methods.

content/renderer/media/rtc_video_decoder.h

Index: content/renderer/media/rtc_video_decoder.h
diff --git a/content/renderer/media/rtc_video_decoder.h b/content/renderer/media/rtc_video_decoder.h
index 285861129dd96becbaa1260804ac4c2a5939bc46..a242b40183165963a8de89ff3f317557e171e5d3 100644
--- a/content/renderer/media/rtc_video_decoder.h
+++ b/content/renderer/media/rtc_video_decoder.h
@@ -32,9 +32,10 @@ class RTCVideoDecoder
   virtual void Initialize(media::DemuxerStream* demuxer_stream,
                           media::FilterCallback* filter_callback,
                           media::StatisticsCallback* stat_callback);
-  virtual const media::MediaFormat& media_format();
   virtual void ProduceVideoFrame(scoped_refptr<media::VideoFrame> video_frame);
   virtual bool ProvidesBuffer();
+  virtual int width();
+  virtual int height();
 
   // cricket::VideoRenderer implementation
   virtual bool SetSize(int width, int height, int reserved);
@@ -60,7 +61,6 @@ class RTCVideoDecoder
   size_t height_;
   std::string url_;
   DecoderState state_;
-  media::MediaFormat media_format_;
   std::deque<scoped_refptr<media::VideoFrame> > frame_queue_available_;
   // Used for accessing frame queue from another thread.
   base::Lock lock_;