Extract common per-network proxy configuration functions.

chrome/browser/chromeos/ui_proxy_config.h

Index: chrome/browser/chromeos/ui_proxy_config.h
diff --git a/chrome/browser/chromeos/ui_proxy_config.h b/chrome/browser/chromeos/ui_proxy_config.h
index 6d7c4d493df4114090086e34c0e7e7c57e033762..4541c8f1ef1373113b184547826691bb1700378a 100644
--- a/chrome/browser/chromeos/ui_proxy_config.h
+++ b/chrome/browser/chromeos/ui_proxy_config.h
@@ -73,16 +73,12 @@ struct UIProxyConfig {
 
   // Converts |this| to Dictionary of ProxyConfigDictionary format (which
   // is the same format used by prefs).
-  base::DictionaryValue* ToPrefProxyConfig();
+  base::DictionaryValue* ToPrefProxyConfig() const;
 
   // Map |scheme| (one of "http", "https", "ftp" or "socks") to the correct
   // ManualProxy.  Returns NULL if scheme is invalid.
   ManualProxy* MapSchemeToProxy(const std::string& scheme);
 
-  // Serializes config into a ProxyConfigDictionary and then std::string
-  // persisted as string property in shill for a network.
-  bool SerializeForNetwork(std::string* output);
-
   // Encodes the proxy server as "<url-scheme>=<proxy-scheme>://<proxy>"
   static void EncodeAndAppendProxyServer(const std::string& url_scheme,
                                          const net::ProxyServer& server,