Remove reference counting from media::DemuxerStream and friends.

media/filters/opus_audio_decoder.h

Index: media/filters/opus_audio_decoder.h
diff --git a/media/filters/opus_audio_decoder.h b/media/filters/opus_audio_decoder.h
index e3dea3d5f095ce71e92e44c6adadb0cf75af4c41..18201ff7f1b9a3b57c46ee653d6eac2c8b5bd8d6 100644
--- a/media/filters/opus_audio_decoder.h
+++ b/media/filters/opus_audio_decoder.h
@@ -30,7 +30,7 @@ class MEDIA_EXPORT OpusAudioDecoder : public AudioDecoder {
   virtual ~OpusAudioDecoder();
 
   // AudioDecoder 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;
@@ -56,7 +56,7 @@ class MEDIA_EXPORT OpusAudioDecoder : public AudioDecoder {
   base::WeakPtrFactory<OpusAudioDecoder> weak_factory_;
   base::WeakPtr<OpusAudioDecoder> weak_this_;
 
-  scoped_refptr<DemuxerStream> demuxer_stream_;
+  DemuxerStream* demuxer_stream_;
   StatisticsCB statistics_cb_;
   OpusMSDecoder* opus_decoder_;