Minor cleanup to remove the static thread-safe methods on BrowserMainLoop. Initially I thought this…

content/browser/renderer_host/media/web_contents_audio_input_stream.h

Index: content/browser/renderer_host/media/web_contents_audio_input_stream.h
===================================================================
--- content/browser/renderer_host/media/web_contents_audio_input_stream.h	(revision 207505)
+++ content/browser/renderer_host/media/web_contents_audio_input_stream.h	(working copy)
@@ -58,7 +58,8 @@
   static WebContentsAudioInputStream* Create(
       const std::string& device_id,
       const media::AudioParameters& params,
-      const scoped_refptr<base::MessageLoopProxy>& message_loop);
+      const scoped_refptr<base::MessageLoopProxy>& message_loop,
+      AudioMirroringManager* audio_mirroring_manager);
 
  private:
   friend class WebContentsAudioInputStreamTest;