Remove platform_video_capturing_mac and the callback thread checker in VideoCaptureDeviceAVFoundati…

media/capture/video/mac/video_capture_device_mac.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.
 
 // MacOSX implementation of generic VideoCaptureDevice, using AVFoundation as
 // native capture API. AVFoundation is available in versions 10.7 (Lion) and
 // later.
 
 #ifndef MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
 #define MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
 
 #import <Foundation/Foundation.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/video_capture_types.h"
 #include "media/capture/video/video_capture_device.h"
 
-@protocol PlatformVideoCapturingMac;
+@class VideoCaptureDeviceAVFoundation;
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 // Small class to bundle device name and connection type into a dictionary.
@@ skipping 53 matching lines @@
 
   Name device_name_;
   scoped_ptr<VideoCaptureDevice::Client> client_;
 
   VideoCaptureFormat capture_format_;
 
   // Only read and write state_ from inside this loop.
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   InternalState state_;
 
-  id<PlatformVideoCapturingMac> capture_device_;
+  base::scoped_nsobject<VideoCaptureDeviceAVFoundation> capture_device_;
 
   base::TimeDelta first_timestamp_;
   base::TimeTicks first_aligned_timestamp_;
 
   // Used with Bind and PostTask to ensure that methods aren't called after the
   // VideoCaptureDeviceMac is destroyed.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoCaptureDeviceMac> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceMac);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_