Remove deprecated QTKit Video Capture Support

media/capture/video/mac/video_capture_device_factory_mac.h

 // Copyright 2014 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.
 
 // Implementation of a VideoCaptureDeviceFactory class for Mac.
 
 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_
 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_
 
 #include "base/macros.h"
 #include "media/capture/video/video_capture_device_factory.h"
 
 namespace media {
 
 // Extension of VideoCaptureDeviceFactory to create and manipulate Mac devices.
 class MEDIA_EXPORT VideoCaptureDeviceFactoryMac
     : public VideoCaptureDeviceFactory {
  public:
-  explicit VideoCaptureDeviceFactoryMac(
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
+  VideoCaptureDeviceFactoryMac();
   ~VideoCaptureDeviceFactoryMac() override;
 
   scoped_ptr<VideoCaptureDevice> Create(
       const VideoCaptureDevice::Name& device_name) override;
   void GetDeviceNames(VideoCaptureDevice::Names* device_names) override;
   void EnumerateDeviceNames(const base::Callback<
       void(scoped_ptr<media::VideoCaptureDevice::Names>)>& callback) override;
   void GetDeviceSupportedFormats(
       const VideoCaptureDevice::Name& device,
       VideoCaptureFormats* supported_formats) override;
 
  private:
-  // Cache of |ui_task_runner| for enumerating devices there for QTKit.
-  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
-
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactoryMac);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_