Add FilePath to base namespace.

chrome/app/chrome_main_mac.h

 // Copyright (c) 2011 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_APP_CHROME_MAIN_MAC_H_
 #define CHROME_APP_CHROME_MAIN_MAC_H_
 
+namespace base {
 class FilePath;
+}
 
 // Checks if the UserDataDir policy has been set and returns its value in the
 // |user_data_dir| parameter. If no policy is set the parameter is not changed.
-void CheckUserDataDirPolicy(FilePath* user_data_dir);
+void CheckUserDataDirPolicy(base::FilePath* user_data_dir);
 
 // Sets the app bundle (base::mac::FrameworkBundle()) to the framework's bundle,
 // and sets the base bundle ID (base::mac::BaseBundleID()) to the proper value
 // based on the running application. The base bundle ID is the outer browser
 // application's bundle ID even when running in a non-browser (helper)
 // process.
 void SetUpBundleOverrides();
 
 #endif  // CHROME_APP_CHROME_MAIN_MAC_H_