Storing raw audio sink for default audio track.

talk/media/webrtc/fakewebrtccall.h

Index: talk/media/webrtc/fakewebrtccall.h
diff --git a/talk/media/webrtc/fakewebrtccall.h b/talk/media/webrtc/fakewebrtccall.h
index 3528c7a7b1e1e12a2290e71a5e9f5660bd5707f9..d6fe6871472e0c9d885142cbcd83dbdaa23a9e05 100644
--- a/talk/media/webrtc/fakewebrtccall.h
+++ b/talk/media/webrtc/fakewebrtccall.h
@@ -89,6 +89,7 @@ class FakeAudioReceiveStream final : public webrtc::AudioReceiveStream {
   void SetStats(const webrtc::AudioReceiveStream::Stats& stats);
   int received_packets() const { return received_packets_; }
   void IncrementReceivedPackets();
+  rtc::scoped_refptr<webrtc::AudioSinkInterface> sink() const { return sink_; }
 
  private:
   // webrtc::ReceiveStream implementation.
@@ -106,12 +107,12 @@ class FakeAudioReceiveStream final : public webrtc::AudioReceiveStream {
 
   // webrtc::AudioReceiveStream implementation.
   webrtc::AudioReceiveStream::Stats GetStats() const override;
-  void SetSink(rtc::scoped_ptr<webrtc::AudioSinkInterface> sink) override;
+  void SetSink(rtc::scoped_refptr<webrtc::AudioSinkInterface> sink) override;
 
   webrtc::AudioReceiveStream::Config config_;
   webrtc::AudioReceiveStream::Stats stats_;
   int received_packets_;
-  rtc::scoped_ptr<webrtc::AudioSinkInterface> sink_;
+  rtc::scoped_refptr<webrtc::AudioSinkInterface> sink_;
 };
 
 class FakeVideoSendStream final : public webrtc::VideoSendStream,