[Mojo Video Capture] Use actual factory instances implementing media::VideoCaptureDeviceFactory

media/capture/video/video_capture_device_factory.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.
 
 #ifndef MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_FACTORY_H_
 #define MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "media/capture/video/video_capture_device.h"
@@ skipping 27 matching lines @@
           void(std::unique_ptr<VideoCaptureDeviceDescriptors>)>& callback);
 
   // Obtains the supported formats of a device.
   // This method should be called before allocating or starting a device. In
   // case format enumeration is not supported, or there was a problem
   // |supported_formats| will be empty.
   virtual void GetSupportedFormats(
       const VideoCaptureDeviceDescriptor& device_descriptor,
       VideoCaptureFormats* supported_formats) = 0;
 
- protected:
   // Gets descriptors of all video capture devices connected.
   // Used by the default implementation of EnumerateDevices().
   // Note: The same physical device may appear more than once if it is
   // accessible through different APIs.
   virtual void GetDeviceDescriptors(
       VideoCaptureDeviceDescriptors* device_descriptors) = 0;
 
+ protected:
   base::ThreadChecker thread_checker_;
 
  private:
   static VideoCaptureDeviceFactory* CreateVideoCaptureDeviceFactory(
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_FACTORY_H_