Remove #pragma once from chrome/service

chrome/service/cloud_print/printer_job_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 CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_
 #define CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_
-#pragma once
 
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop_proxy.h"
 #include "base/threading/thread.h"
@@ skipping 286 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(PrinterJobHandler);
 };
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef PrinterJobHandler::Delegate PrinterJobHandlerDelegate;
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_