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

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
===================================================================
--- content/browser/renderer_host/render_message_filter.h	(revision 207505)
+++ content/browser/renderer_host/render_message_filter.h	(working copy)
@@ -55,6 +55,7 @@
 }
 
 namespace media {
+class AudioManager;
 struct MediaLogEvent;
 }
 
@@ -87,6 +88,7 @@
                       BrowserContext* browser_context,
                       net::URLRequestContextGetter* request_context,
                       RenderWidgetHelper* render_widget_helper,
+                      media::AudioManager* audio_manager,
                       MediaInternals* media_internals,
                       DOMStorageContextImpl* dom_storage_context);
 
@@ -302,6 +304,7 @@
   // Used for sampling CPU usage of the renderer process.
   scoped_ptr<base::ProcessMetrics> process_metrics_;
 
+  media::AudioManager* audio_manager_;
   MediaInternals* media_internals_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderMessageFilter);