[Sync] Removing duplicated includes between cc and h files.

components/sync/core/internal_components_factory_impl.cc

 // 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.
 
 #include "components/sync/core/internal_components_factory_impl.h"
 
-#include <string>
-#include <vector>
-
 #include "components/sync/engine_impl/backoff_delay_provider.h"
 #include "components/sync/engine_impl/cycle/sync_cycle_context.h"
 #include "components/sync/engine_impl/sync_scheduler_impl.h"
 #include "components/sync/engine_impl/syncer.h"
 #include "components/sync/syncable/on_disk_directory_backing_store.h"
 
 using base::TimeDelta;
 
 namespace syncer {
 
@@ skipping 47 matching lines @@
     return std::unique_ptr<syncable::DirectoryBackingStore>();
   }
 }
 
 InternalComponentsFactory::Switches InternalComponentsFactoryImpl::GetSwitches()
     const {
   return switches_;
 }
 
 }  // namespace syncer