Remove #pragma once from content

content/public/renderer/render_process_observer.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 CONTENT_PUBLIC_RENDERER_RENDER_PROCESS_OBSERVER_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_PROCESS_OBSERVER_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 
 namespace IPC {
 class Message;
 }
 
 namespace content {
 
@@ skipping 18 matching lines @@
 
   virtual void IdleNotification() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderProcessObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_PROCESS_OBSERVER_H_