Change DemuxerStream::ReadCallback to use ref-counted buffers.

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 5e1ba1ad1b4601cc20f09b0ad7431c187c4ab9ea..8583876ef26f3c56ea361e2beca35497e9d310eb 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -64,11 +64,8 @@ class MEDIA_EXPORT FFmpegVideoDecoder
 
   void OnFlushComplete(const base::Closure& callback);
   void OnSeekComplete(const base::Closure& callback);
-  void OnReadComplete(Buffer* buffer);
-
-  // TODO(jiesun): until demuxer pass scoped_refptr<Buffer>: we could not merge
-  // this with OnReadComplete
-  void OnReadCompleteTask(scoped_refptr<Buffer> buffer);
+  void OnReadComplete(const scoped_refptr<Buffer>& buffer);
+  void OnReadCompleteTask(const scoped_refptr<Buffer>& buffer);
 
   // Flush the output buffers that we had held in Paused state.
   void FlushBuffers();