Remove #pragma once from sync

sync/engine/all_status.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.
 //
 // The AllStatus object watches various sync engine components and aggregates
 // the status of all of them into one place.
 
 #ifndef SYNC_INTERNAL_API_ALL_STATUS_H_
 #define SYNC_INTERNAL_API_ALL_STATUS_H_
-#pragma once
 
 #include <map>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "sync/engine/sync_engine_event.h"
 #include "sync/engine/syncer_types.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/engine/sync_status.h"
@@ skipping 52 matching lines @@
  public:
   explicit ScopedStatusLock(AllStatus* allstatus);
   ~ScopedStatusLock();
  protected:
   AllStatus* allstatus_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_ALL_STATUS_H_