Remove #pragma once from content

content/browser/debugger/devtools_frontend_host.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_BROWSER_DEBUGGER_DEVTOOLS_FRONTEND_HOST_H_
 #define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_FRONTEND_HOST_H_
-#pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/public/browser/devtools_client_host.h"
 #include "content/public/browser/render_view_host_observer.h"
 
 class WebContentsImpl;
 
@@ skipping 35 matching lines @@
   void OnAppend(const std::string& url, const std::string& content);
 
   WebContentsImpl* web_contents_;
   DevToolsFrontendHostDelegate* delegate_;
   DISALLOW_COPY_AND_ASSIGN(DevToolsFrontendHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_FRONTEND_HOST_H_