Remove #pragma once from sync

sync/engine/process_updates_command.h

 // 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.
 
 #ifndef SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_
 #define SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "sync/engine/model_changing_syncer_command.h"
 #include "sync/engine/syncer_types.h"
 
 namespace sync_pb {
 class SyncEntity;
 }
 
 namespace syncer {
@@ skipping 28 matching lines @@
   ServerUpdateProcessingResult ProcessUpdate(
       const sync_pb::SyncEntity& proto_update,
       const Cryptographer* cryptographer,
       syncable::WriteTransaction* const trans);
   DISALLOW_COPY_AND_ASSIGN(ProcessUpdatesCommand);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_