Fix webrtcAudioPrivate API to handle requests from <webview>s.

content/public/browser/render_view_host.h

Index: content/public/browser/render_view_host.h
diff --git a/content/public/browser/render_view_host.h b/content/public/browser/render_view_host.h
index 07fc988046928ee420d5df355a5bc12c4ea11272..018884c1edeb2a1ef79a40d9793226d93181d9a8 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -5,8 +5,6 @@
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_
 
-#include <list>
-
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_widget_host.h"
@@ -31,10 +29,6 @@ namespace gfx {
 class Point;
 }
 
-namespace media {
-class AudioOutputController;
-}
-
 namespace content {
 
 class ChildProcessSecurityPolicy;
@@ -199,16 +193,6 @@ class CONTENT_EXPORT RenderViewHost : virtual public RenderWidgetHost {
   // Passes a list of Webkit preferences to the renderer.
   virtual void UpdateWebkitPreferences(const WebPreferences& prefs) = 0;
 
-  // Retrieves the list of AudioOutputController objects associated
-  // with this object and passes it to the callback you specify, on
-  // the same thread on which you called the method.
-  typedef std::list<scoped_refptr<media::AudioOutputController> >
-      AudioOutputControllerList;
-  typedef base::Callback<void(const AudioOutputControllerList&)>
-      GetAudioOutputControllersCallback;
-  virtual void GetAudioOutputControllers(
-      const GetAudioOutputControllersCallback& callback) const = 0;
-
   // Notify the render view host to select the word around the caret.
   virtual void SelectWordAroundCaret() = 0;