Remove #pragma once from content

content/public/browser/browser_url_handler.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_URL_HANDLER_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_URL_HANDLER_H_
-#pragma once
 
 #include "content/common/content_export.h"
 
 class GURL;
 
 namespace content {
 class BrowserContext;
 
 // We handle some special browser-level URLs (like "about:version")
 // before they're handed to a renderer.  This lets us do the URL handling
@@ skipping 30 matching lines @@
   virtual void AddHandlerPair(URLHandler handler,
                               URLHandler reverse_handler) = 0;
 
  protected:
   virtual ~BrowserURLHandler() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_URL_HANDLER_H_