IWYU for chrome/browser/media_gallery/mtp_device_delegate_impl.h.

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 "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
 
+#include "base/callback_forward.h"
 #include "base/file_path.h"
 #include "webkit/fileapi/media/mtp_device_delegate.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace chrome {
 
 typedef base::Callback<void(fileapi::MTPDeviceDelegate*)>
     CreateMTPDeviceDelegateCallback;
 
 void CreateMTPDeviceDelegate(const FilePath::StringType& device_location,
                              base::SequencedTaskRunner* media_task_runner,
                              const CreateMTPDeviceDelegateCallback& callback);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_H_