Fix IWYU in base/files/file.h

chrome/browser/chromeos/drive/file_system_util.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_CHROMEOS_DRIVE_FILE_SYSTEM_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_UTIL_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
+#include "base/files/file_path.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "url/gurl.h"
 
 class Profile;
 
-namespace base {
-class FilePath;
-}
-
 namespace fileapi {
 class FileSystemURL;
 }
 
 namespace drive {
 
 class DriveAppRegistry;
 class DriveServiceInterface;
 class FileSystemInterface;
 
@@ skipping 182 matching lines @@
   DRIVE_CONNECTED,
 };
 
 // Returns the Drive connection status for the |profile|.
 ConnectionStatusType GetDriveConnectionStatus(Profile* profile);
 
 }  // namespace util
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_UTIL_H_