This adds Cros API for calling the "Refresh" function on shill's

chrome/browser/chromeos/cros/cros_network_functions.cc

Index: chrome/browser/chromeos/cros/cros_network_functions.cc
diff --git a/chrome/browser/chromeos/cros/cros_network_functions.cc b/chrome/browser/chromeos/cros/cros_network_functions.cc
index c3946de8236a15307dbd548f60ff41dd221de6b3..48db1194b99c0e1480b4e8ff9a0768520a7c650b 100644
--- a/chrome/browser/chromeos/cros/cros_network_functions.cc
+++ b/chrome/browser/chromeos/cros/cros_network_functions.cc
@@ -680,6 +680,12 @@ bool CrosRemoveIPConfig(const std::string& ipconfig_path) {
       CallRemoveAndBlock(dbus::ObjectPath(ipconfig_path));
 }
 
+void CrosRequestIPConfigRefresh(const std::string& ipconfig_path) {
+  DBusThreadManager::Get()->GetFlimflamIPConfigClient()->Refresh(
+      dbus::ObjectPath(ipconfig_path),
+      base::Bind(&DoNothing));
+}
+
 bool CrosGetWifiAccessPoints(WifiAccessPointVector* result) {
   scoped_ptr<base::DictionaryValue> manager_properties(
       DBusThreadManager::Get()->GetFlimflamManagerClient()->