Remove #pragma once from sync

sync/test/engine/fake_model_worker.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_TEST_ENGINE_FAKE_MODEL_WORKER_H_
 #define SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
-#pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/threading/non_thread_safe.h"
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 #include "sync/internal_api/public/util/syncer_error.h"
 
 namespace syncer {
@@ skipping 14 matching lines @@
 
   const ModelSafeGroup group_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeModelWorker);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_