Remove #pragma once from content

content/browser/browser_url_handler_impl.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_BROWSER_BROWSER_URL_HANDLER_IMPL_H_
 #define CONTENT_BROWSER_BROWSER_URL_HANDLER_IMPL_H_
-#pragma once
 
 #include <vector>
 #include <utility>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/browser_url_handler.h"
 
 class GURL;
 
@@ skipping 28 matching lines @@
   typedef std::pair<URLHandler, URLHandler> HandlerPair;
   std::vector<HandlerPair> url_handlers_;
 
   FRIEND_TEST_ALL_PREFIXES(BrowserURLHandlerImplTest, BasicRewriteAndReverse);
   FRIEND_TEST_ALL_PREFIXES(BrowserURLHandlerImplTest, NullHandlerReverse);
 
   DISALLOW_COPY_AND_ASSIGN(BrowserURLHandlerImpl);
 };
 
 #endif  // CONTENT_BROWSER_BROWSER_URL_HANDLER_IMPL_H_