Remove #pragma once from sync

sync/test/engine/syncer_command_test.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_SYNCER_COMMAND_TEST_H_
 #define SYNC_TEST_ENGINE_SYNCER_COMMAND_TEST_H_
-#pragma once
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "sync/engine/model_changing_syncer_command.h"
 #include "sync/engine/throttled_data_type_tracker.h"
@@ skipping 210 matching lines @@
 
   virtual void SetUp() OVERRIDE;
 
   TestUnrecoverableErrorHandler handler_;
   syncable::MockDirectory mock_directory_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_SYNCER_COMMAND_TEST_H_