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

chrome/browser/sync/glue/sync_backend_host.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_SYNC_GLUE_SYNC_BACKEND_HOST_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_
 #pragma once
 
 #include <map>
-#include <set>
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/lock.h"
 #include "base/message_loop.h"
 #include "base/ref_counted.h"
 #include "base/thread.h"
 #include "base/timer.h"
 #include "chrome/browser/google_service_auth_error.h"
@@ skipping 452 matching lines @@
 
   // Whether we've processed the initialization complete callback.
   bool syncapi_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHost);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_