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

components/sync/driver/glue/sync_backend_registrar.cc

 // Copyright 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/driver/glue/sync_backend_registrar.h"
 
 #include <algorithm>
 #include <cstddef>
 #include <utility>
 
-#include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "components/sync/core/user_share.h"
 #include "components/sync/driver/change_processor.h"
 #include "components/sync/driver/sync_client.h"
 
 using syncer::ModelSafeGroup;
 using syncer::ModelSafeRoutingInfo;
 using syncer::ModelType;
 using syncer::ModelTypeSet;
@@ skipping 360 matching lines @@
   return sync_thread_.get();
 }
 
 ModelSafeGroup SyncBackendRegistrar::GetInitialGroupForType(
     ModelType type) const {
   return non_blocking_types_.Has(type) ? syncer::GROUP_NON_BLOCKING
                                        : syncer::GROUP_PASSIVE;
 }
 
 }  // namespace browser_sync