Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/api/proxy/proxy_api_helpers.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.
 
 // Definition of helper functions for the Chrome Extensions Proxy Settings API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_HELPERS_H_
-#pragma once
 
 #include <string>
 
 #include "chrome/browser/prefs/proxy_prefs.h"
 #include "net/proxy/proxy_config.h"
 
 class ProxyConfigDictionary;
 
 namespace base {
 class DictionaryValue;
@@ skipping 109 matching lines @@
 
 // Tokenizes the |in| at delimiters |delims| and returns a new ListValue with
 // StringValues created from the tokens. Ownership is passed to the caller.
 base::ListValue* TokenizeToStringList(const std::string& in,
                                       const std::string& delims);
 
 }  // namespace proxy_api_helpers
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_HELPERS_H_