Revert of MediaStream audio object graph untangling and clean-ups.

content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h

Index: content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h
diff --git a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h
index a4ef6d162c8498a244064fc00e8dd0fb881a7deb..b22f09676b634d23010b0b534072011fcc5cea37 100644
--- a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h
+++ b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h
@@ -147,7 +147,8 @@
   scoped_refptr<webrtc::VideoTrackSourceInterface> CreateVideoSource(
       cricket::VideoCapturer* capturer,
       const blink::WebMediaConstraints& constraints) override;
-  void CreateWebAudioSource(blink::WebMediaStreamSource* source) override;
+  scoped_refptr<WebAudioCapturerSource> CreateWebAudioSource(
+      blink::WebMediaStreamSource* source) override;
   scoped_refptr<webrtc::MediaStreamInterface> CreateLocalMediaStream(
       const std::string& label) override;
   scoped_refptr<webrtc::VideoTrackInterface> CreateLocalVideoTrack(
@@ -165,7 +166,7 @@
       int sdp_mline_index,
       const std::string& sdp) override;
 
-  scoped_ptr<WebRtcAudioCapturer> CreateAudioCapturer(
+  scoped_refptr<WebRtcAudioCapturer> CreateAudioCapturer(
       int render_frame_id,
       const StreamDeviceInfo& device_info,
       const blink::WebMediaConstraints& constraints,
@@ -173,6 +174,8 @@
   void FailToCreateNextAudioCapturer() {
     fail_to_create_next_audio_capturer_ = true;
   }
+
+  void StartLocalAudioTrack(WebRtcLocalAudioTrack* audio_track) override;
 
   MockAudioSource* last_audio_source() { return last_audio_source_.get(); }