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

chrome/browser/history/history.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_HISTORY_HISTORY_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_H_
 #pragma once
 
-#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/task.h"
 #include "chrome/browser/cancelable_request.h"
@@ skipping 827 matching lines @@
 
   // Cached values from Init(), used whenever we need to reload the backend.
   FilePath history_dir_;
   BookmarkService* bookmark_service_;
   bool no_db_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_H_