Factor out AudioOutputDelegate from AudioRendererHost.

content/browser/browser_main_loop.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_BROWSER_BROWSER_MAIN_LOOP_H_
 #define CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
@@ skipping 54 matching lines @@
 class NetworkChangeNotifier;
 }  // namespace net
 
 #if defined(USE_OZONE)
 namespace ui {
 class ClientNativePixmapFactory;
 }  // namespace ui
 #endif
 
 namespace content {
+class AudioDeviceThread;
 class BrowserMainParts;
 class BrowserOnlineStateObserver;
 class BrowserThreadImpl;
 class LoaderDelegateImpl;
 class MediaStreamManager;
 class ResourceDispatcherHostImpl;
 class SaveFileManager;
 class ServiceManagerContext;
 class SpeechRecognitionManagerImpl;
 class StartupTaskRunner;
@@ skipping 195 matching lines @@
   std::unique_ptr<BrowserProcessSubThread> io_thread_;
 
   // Members initialized in |BrowserThreadsStarted()| --------------------------
   std::unique_ptr<base::Thread> indexed_db_thread_;
   std::unique_ptr<ServiceManagerContext> service_manager_context_;
   std::unique_ptr<mojo::edk::ScopedIPCSupport> mojo_ipc_support_;
 
   // |user_input_monitor_| has to outlive |audio_manager_|, so declared first.
   std::unique_ptr<media::UserInputMonitor> user_input_monitor_;
   // AudioThread needs to outlive |audio_manager_|.
-  std::unique_ptr<base::Thread> audio_thread_;
+  std::unique_ptr<AudioDeviceThread> audio_thread_;
   media::ScopedAudioManagerPtr audio_manager_;
 
   std::unique_ptr<midi::MidiManager> midi_manager_;
 
 #if defined(OS_WIN)
   std::unique_ptr<media::SystemMessageWindowWin> system_message_window_;
 #elif defined(OS_LINUX) && defined(USE_UDEV)
   std::unique_ptr<media::DeviceMonitorLinux> device_monitor_linux_;
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
   std::unique_ptr<media::DeviceMonitorMac> device_monitor_mac_;
@@ skipping 10 matching lines @@
   scoped_refptr<SaveFileManager> save_file_manager_;
 
   // DO NOT add members here. Add them to the right categories above.
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_