[Media Gallery] Added code to support mtp device media file system on Windows.

chrome/browser/media_gallery/mtp_device_delegate_impl.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.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_H_
 #define CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_H_
 
 #include "build/build_config.h"
 #include "webkit/fileapi/media/mtp_device_file_system_config.h"
 
 #if !defined(SUPPORT_MTP_DEVICE_FILESYSTEM)
 #error "Media file system is not supported for this platform."
 #endif
 
 #if defined(OS_LINUX)  // Implies OS_CHROMEOS
 #include "chrome/browser/media_gallery/mtp_device_delegate_impl_linux.h"
+#elif defined(OS_WIN)
+#include "chrome/browser/media_gallery/win/mtp_device_delegate_impl_win.h"
 #endif
 
 namespace chrome {
 
 // TODO(kmadhusu): Implement MTP device delegates on other platforms.
 #if defined(OS_LINUX)  // Implies OS_CHROMEOS
 typedef class MTPDeviceDelegateImplLinux MTPDeviceDelegateImpl;
+#elif defined(OS_WIN)
+typedef class MTPDeviceDelegateImplWin MTPDeviceDelegateImpl;
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_H_