Cleaned up the WebRtcAudioCapturer a bit.

content/renderer/media/mock_media_stream_dependency_factory.cc

Index: content/renderer/media/mock_media_stream_dependency_factory.cc
diff --git a/content/renderer/media/mock_media_stream_dependency_factory.cc b/content/renderer/media/mock_media_stream_dependency_factory.cc
index 8de0e2b43ddee0e639e89184c3f05d508a9e567a..a68f939e54333f4c5c27d0596b616fa5a650537a 100644
--- a/content/renderer/media/mock_media_stream_dependency_factory.cc
+++ b/content/renderer/media/mock_media_stream_dependency_factory.cc
@@ -455,10 +455,10 @@ MockMediaStreamDependencyFactory::CreateLocalAudioTrack(
     webrtc::AudioSourceInterface* source,
     const webrtc::MediaConstraintsInterface* constraints) {
   DCHECK(mock_pc_factory_created_);
-  DCHECK(!capturer.get());
+  scoped_refptr<WebRtcAudioCapturer> audio_capturer = capturer ?

[perkj_chrome, 2014/01/12 21:53:06]

This  seem strange. Why don't you know if you must create a capturer or not? 

[no longer working on chromium, 2014/01/13 16:59:59]

Previously the capturer is got from WebRtcAudioDeviceImpl, and we know for sure
that in unittests WebRtcAudioDeviceImpl does not exist.
But this CL changes the code that the capturer will be got from the existing
source. So the capturer might exist or might not, depending on how the unittests
are written.

+      capturer : WebRtcAudioCapturer::CreateCapturer(-1, StreamDeviceInfo());
   return WebRtcLocalAudioTrack::Create(
-      id, WebRtcAudioCapturer::CreateCapturer(), webaudio_source,
-      source, constraints);
+      id, audio_capturer, webaudio_source, source, constraints);
 }
 
 SessionDescriptionInterface*
@@ -478,9 +478,9 @@ MockMediaStreamDependencyFactory::CreateIceCandidate(
 }
 
 scoped_refptr<WebRtcAudioCapturer>
-MockMediaStreamDependencyFactory::MaybeCreateAudioCapturer(
+MockMediaStreamDependencyFactory::CreateAudioCapturer(
     int render_view_id, const StreamDeviceInfo& device_info) {
-  return WebRtcAudioCapturer::CreateCapturer();
+  return WebRtcAudioCapturer::CreateCapturer(-1, device_info);
 }
 
 }  // namespace content