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

content/public/test/mock_render_process_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_vector.h"
 #include "base/observer_list.h"
@@ skipping 94 matching lines @@
   int GetActiveViewCount();
 
   void set_is_isolated_guest(bool is_isolated_guest) {
     is_isolated_guest_ = is_isolated_guest;
   }
 
   void SetProcessHandle(scoped_ptr<base::ProcessHandle> new_handle) {
     process_handle = new_handle.Pass();
   }
 
+  void GetAudioOutputControllers(
+      const GetAudioOutputControllersCallback& callback) const override {}
+
  private:
   // Stores IPC messages that would have been sent to the renderer.
   IPC::TestSink sink_;
   int bad_msg_count_;
   const MockRenderProcessHostFactory* factory_;
   int id_;
   BrowserContext* browser_context_;
   ObserverList<RenderProcessHostObserver> observers_;
 
   IDMap<RenderWidgetHost> render_widget_hosts_;
@@ skipping 26 matching lines @@
   // for deleting all MockRenderProcessHosts that have not deleted by a test in
   // the destructor and prevent them from being leaked.
   mutable ScopedVector<MockRenderProcessHost> processes_;
 
   DISALLOW_COPY_AND_ASSIGN(MockRenderProcessHostFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_