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

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 94eb29a01f362276b3243968ba7ef0824498d5e3..7798252fe13608d74044e1c14138217426237091 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -1360,13 +1360,6 @@ void RenderViewHostImpl::OnWebkitPreferencesChanged() {
   updating_web_preferences_ = false;
 }
 
-void RenderViewHostImpl::GetAudioOutputControllers(
-    const GetAudioOutputControllersCallback& callback) const {
-  scoped_refptr<AudioRendererHost> audio_host =
-      static_cast<RenderProcessHostImpl*>(GetProcess())->audio_renderer_host();
-  audio_host->GetOutputControllers(GetRoutingID(), callback);
-}
-
 void RenderViewHostImpl::ClearFocusedElement() {
   is_focused_element_editable_ = false;
   Send(new ViewMsg_ClearFocusedElement(GetRoutingID()));