Storing raw audio sink for default audio track.

talk/session/media/channel.h

Index: talk/session/media/channel.h
diff --git a/talk/session/media/channel.h b/talk/session/media/channel.h
index d8fde670a0ec5b714023da1f440faa34254f33c4..4cfefd899bec3932181dcb4040f6faba8a60c803 100644
--- a/talk/session/media/channel.h
+++ b/talk/session/media/channel.h
@@ -375,8 +375,9 @@ class VoiceChannel : public BaseChannel {
   // event 0-9, *, #, A-D.
   bool InsertDtmf(uint32_t ssrc, int event_code, int duration);
   bool SetOutputVolume(uint32_t ssrc, double volume);
-  void SetRawAudioSink(uint32_t ssrc,
-                       rtc::scoped_ptr<webrtc::AudioSinkInterface> sink);
+  void SetRawAudioSink(
+      uint32_t ssrc,
+      const rtc::scoped_refptr<webrtc::AudioSinkInterface>& sink);
 
   // Get statistics about the current media session.
   bool GetStats(VoiceMediaInfo* stats);