Revert of 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 a268fc52ccd027c8bb8a05029f94c5d731ecd6fc..186618b2dbe214d0b86a52be3ed42f0cf152ecb7 100644
--- a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
@@ -370,8 +370,11 @@
   return nullptr;
 }
 
-void MockPeerConnectionDependencyFactory::CreateWebAudioSource(
-    blink::WebMediaStreamSource* source) {}
+scoped_refptr<WebAudioCapturerSource>
+MockPeerConnectionDependencyFactory::CreateWebAudioSource(
+    blink::WebMediaStreamSource* source) {
+  return NULL;
+}
 
 scoped_refptr<webrtc::MediaStreamInterface>
 MockPeerConnectionDependencyFactory::CreateLocalMediaStream(
@@ -412,7 +415,7 @@
   return new MockIceCandidate(sdp_mid, sdp_mline_index, sdp);
 }
 
-scoped_ptr<WebRtcAudioCapturer>
+scoped_refptr<WebRtcAudioCapturer>
 MockPeerConnectionDependencyFactory::CreateAudioCapturer(
     int render_frame_id,
     const StreamDeviceInfo& device_info,
@@ -427,4 +430,9 @@
                                              audio_source);
 }
 
+void MockPeerConnectionDependencyFactory::StartLocalAudioTrack(
+      WebRtcLocalAudioTrack* audio_track) {
+  audio_track->Start();
+}
+
 }  // namespace content