Cleanup the UseSharedProxies preference.

chrome/browser/chromeos/net/proxy_config_handler.h

 // Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_
 
 #include "base/memory/scoped_ptr.h"
 
 class ProxyConfigDictionary;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace chromeos {
 
 class NetworkState;
 
 namespace proxy_config {
 
 scoped_ptr<ProxyConfigDictionary> GetProxyConfigForNetwork(
     const NetworkState& network);
 
 void SetProxyConfigForNetwork(const ProxyConfigDictionary& proxy_config,
                               const NetworkState& network);
 
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
 }  // namespace proxy_config
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_