Remove reference counting from media::Demuxer and friends.

media/filters/vpx_video_decoder.h

Index: media/filters/vpx_video_decoder.h
diff --git a/media/filters/vpx_video_decoder.h b/media/filters/vpx_video_decoder.h
index aea47bb1455cf81c6b57bb91d57352880bf2fc16..6b04df26f99c54487b392ac70f34dde9ba81b6d5 100644
--- a/media/filters/vpx_video_decoder.h
+++ b/media/filters/vpx_video_decoder.h
@@ -26,7 +26,7 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
   virtual ~VpxVideoDecoder();
 
   // VideoDecoder implementation.
-  virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
+  virtual void Initialize(DemuxerStream* stream,
                           const PipelineStatusCB& status_cb,
                           const StatisticsCB& statistics_cb) OVERRIDE;
   virtual void Read(const ReadCB& read_cb) OVERRIDE;
@@ -74,7 +74,7 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
   base::Closure reset_cb_;
 
   // Pointer to the demuxer stream that will feed us compressed buffers.
-  scoped_refptr<DemuxerStream> demuxer_stream_;
+  DemuxerStream* demuxer_stream_;
 
   vpx_codec_ctx* vpx_codec_;