MediaStream audio object graph untangling and clean-ups.

content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
index c414454a926a24d12d29c79e408018db6d7865b8..07962ab618fbdc4ce1906e73171c76b8b91830ed 100644
--- a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
@@ -470,10 +470,10 @@ MockPeerConnectionDependencyFactory::CreateVideoSource(
   return last_video_source_;
 }
 
-scoped_refptr<WebAudioCapturerSource>
+scoped_ptr<WebAudioCapturerSource>
 MockPeerConnectionDependencyFactory::CreateWebAudioSource(
     blink::WebMediaStreamSource* source) {
-  return NULL;
+  return scoped_ptr<WebAudioCapturerSource>(nullptr);
 }
 
 scoped_refptr<webrtc::MediaStreamInterface>
@@ -519,7 +519,7 @@ MockPeerConnectionDependencyFactory::CreateIceCandidate(
   return new MockIceCandidate(sdp_mid, sdp_mline_index, sdp);
 }
 
-scoped_refptr<WebRtcAudioCapturer>
+scoped_ptr<WebRtcAudioCapturer>
 MockPeerConnectionDependencyFactory::CreateAudioCapturer(
     int render_frame_id,
     const StreamDeviceInfo& device_info,
@@ -534,9 +534,4 @@ MockPeerConnectionDependencyFactory::CreateAudioCapturer(
                                              audio_source);
 }
 
-void MockPeerConnectionDependencyFactory::StartLocalAudioTrack(
-      WebRtcLocalAudioTrack* audio_track) {
-  audio_track->Start();
-}
-
 }  // namespace content