Remove #pragma once from content

content/public/browser/browser_shutdown.h

 // Copyright (c) 2011 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 CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_
-#pragma once
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 // This can be used for as-fast-as-possible shutdown, in cases where
 // time for shutdown is limited and we just need to write out as much
 // data as possible before our time runs out.
 //
 // This causes the shutdown sequence embodied by
 // BrowserMainParts::PostMainMessageLoopRun through
 // BrowserMainParts::PostDestroyThreads to occur, i.e. we pretend the
 // message loop finished, all threads are stopped in sequence and then
 // PostDestroyThreads is called.
 //
 // As this violates the normal order of shutdown, likely leaving the
 // process in a bad state, the last thing this function does is
 // terminate the process (right after calling
 // BrowserMainParts::PostDestroyThreads).
 CONTENT_EXPORT void ImmediateShutdownAndExitProcess();
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_