Remove MediaStreamDeviceThread in favor of audio worker TaskRunner.

content/browser/renderer_host/media/video_capture_manager.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.
 
 // VideoCaptureManager is used to open/close, start/stop, enumerate available
 // video capture devices, and manage VideoCaptureController's.
 // All functions are expected to be called from Browser::IO thread. Some helper
 // functions (*OnDeviceThread) will dispatch operations to the device thread.
 // VideoCaptureManager will open OS dependent instances of VideoCaptureDevice.
 // A device can only be opened once.
@@ skipping 23 matching lines @@
 class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
  public:
   // Callback used to signal the completion of a controller lookup.
   typedef base::Callback<
       void(const base::WeakPtr<VideoCaptureController>&)> DoneCB;
 
   VideoCaptureManager();
 
   // Implements MediaStreamProvider.
   virtual void Register(MediaStreamProviderListener* listener,
-                        base::MessageLoopProxy* device_thread_loop) OVERRIDE;
+                        const scoped_refptr<base::SingleThreadTaskRunner>&
+                            device_task_runner) OVERRIDE;
 
   virtual void Unregister() OVERRIDE;
 
   virtual void EnumerateDevices(MediaStreamType stream_type) OVERRIDE;
 
   virtual int Open(const StreamDeviceInfo& device) OVERRIDE;
 
   virtual void Close(int capture_session_id) OVERRIDE;
 
   // Used by unit test to make sure a fake device is used instead of a real
@@ skipping 104 matching lines @@
       scoped_ptr<media::VideoCaptureDevice::Client> client);
 
   // Stop and destroy the VideoCaptureDevice held in
   // |entry->video_capture_device|.
   void DoStopDeviceOnDeviceThread(DeviceEntry* entry);
 
   DeviceInfo* FindDeviceInfoById(const std::string& id,
                                  DeviceInfos& device_vector);
 
   // The message loop of media stream device thread, where VCD's live.
-  scoped_refptr<base::MessageLoopProxy> device_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 
   // Only accessed on Browser::IO thread.
   MediaStreamProviderListener* listener_;
   media::VideoCaptureSessionId new_capture_session_id_;
 
   // An entry is kept in this map for every session that has been created via
   // the Open() entry point. The keys are session_id's. This map is used to
   // determine which device to use when StartCaptureForClient() occurs. Used
   // only on the IO thread.
   std::map<media::VideoCaptureSessionId, MediaStreamDevice> sessions_;
@@ skipping 43 matching lines @@
     TEST_PATTERN,
     Y4M_FILE
   } artificial_device_source_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_