Add FilePath to base namespace.

win8/delegate_execute/chrome_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 WIN8_DELEGATE_EXECUTE_CHROME_UTIL_H_
 #define WIN8_DELEGATE_EXECUTE_CHROME_UTIL_H_
 
 #include "base/string16.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace delegate_execute {
 
 // Finalizes a previously updated installation.
-void UpdateChromeIfNeeded(const FilePath& chrome_exe);
+void UpdateChromeIfNeeded(const base::FilePath& chrome_exe);
 
 // Returns the appid of the Chrome pointed to by |chrome_exe|.
-string16 GetAppId(const FilePath& chrome_exe);
+string16 GetAppId(const base::FilePath& chrome_exe);
 
 }  // namespace delegate_execute
 
 #endif  // WIN8_DELEGATE_EXECUTE_CHROME_UTIL_H_