Remove #pragma once from sync

sync/util/test_unrecoverable_error_handler.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_INTERNAL_API_INCLUDES_TEST_UNRECOVERABLE_ERROR_HANDLER_H_
 #define SYNC_INTERNAL_API_INCLUDES_TEST_UNRECOVERABLE_ERROR_HANDLER_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "sync/internal_api/public/util/unrecoverable_error_handler.h"
 
 namespace syncer {
 
 // Implementation of UnrecoverableErrorHandler that simply adds a
 // gtest failure.
 class TestUnrecoverableErrorHandler : public UnrecoverableErrorHandler {
  public:
   TestUnrecoverableErrorHandler();
   virtual ~TestUnrecoverableErrorHandler();
 
   virtual void OnUnrecoverableError(const tracked_objects::Location& from_here,
                                     const std::string& message) OVERRIDE;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_INCLUDES_TEST_UNRECOVERABLE_ERROR_HANDLER_H_