FBTF: Remove "obviously" unneeded standard C++ library #includes.

chrome/browser/importer/firefox_profile_lock.h

 // Copyright (c) 2010 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_IMPORTER_FIREFOX_PROFILE_LOCK_H__
 #define CHROME_BROWSER_IMPORTER_FIREFOX_PROFILE_LOCK_H__
 #pragma once
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
-#include <string>
-
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
 
 // Firefox is designed to allow only one application to access its
 // profile at the same time.
 // Reference:
 //   http://kb.mozillazine.org/Profile_in_use
 //
 // This class is based on Firefox code in:
@@ skipping 79 matching lines @@
   // Method that tries to put a fcntl lock on file specified by |lock_file_|.
   // Returns false if lock is already held by another process. true in all
   // other cases.
   bool LockWithFcntl();
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(FirefoxProfileLock);
 };
 
 #endif  // CHROME_BROWSER_IMPORTER_FIREFOX_PROFILE_LOCK_H__