VideoCaptureDeviceWin: Extract class-static method into a Factory (both MF/DS)

media/video/capture/win/video_capture_device_factory_win.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.
+// Implementation of a VideoCaptureDeviceFactory class for Windows platforms.
 
-#ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_
-#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_
+#ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_WIN_H_
+#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_WIN_H_
 
 #include "media/video/capture/video_capture_device_factory.h"
 
 namespace media {
 
-// Extension of VideoCaptureDeviceFactory to create and manipulate Mac devices.
-class MEDIA_EXPORT VideoCaptureDeviceFactoryMac :
+// Extension of VideoCaptureDeviceFactory to create and manipulate Windows
+// devices, via either DirectShow or MediaFoundation APIs.
+class MEDIA_EXPORT VideoCaptureDeviceFactoryWin :
     public VideoCaptureDeviceFactory {
  public:
-  VideoCaptureDeviceFactoryMac();
-  virtual ~VideoCaptureDeviceFactoryMac() {}
+  static bool PlatformSupportsMediaFoundation();
+
+  VideoCaptureDeviceFactoryWin() {}
+  virtual ~VideoCaptureDeviceFactoryWin() {}
 
   virtual scoped_ptr<VideoCaptureDevice> Create(
       const VideoCaptureDevice::Name& device_name) OVERRIDE;
   virtual void GetDeviceNames(VideoCaptureDevice::Names* device_names) OVERRIDE;
   virtual void GetDeviceSupportedFormats(
       const VideoCaptureDevice::Name& device,
       VideoCaptureFormats* supported_formats) OVERRIDE;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactoryMac);
+
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactoryWin);
 };
 
 }  // namespace media
 
-#endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_MAC_H_
+#endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_WIN_H_