This converts the Shill clients to allow propagation of shill errors

chromeos/dbus/shill_device_client.h

Index: chromeos/dbus/shill_device_client.h
diff --git a/chromeos/dbus/shill_device_client.h b/chromeos/dbus/shill_device_client.h
index affe2c4a0687698ec6e695c6938fb17fc6879ad4..3440865b73a38104c4f734029ef40752caf8101b 100644
--- a/chromeos/dbus/shill_device_client.h
+++ b/chromeos/dbus/shill_device_client.h
@@ -78,7 +78,8 @@ class CHROMEOS_EXPORT ShillDeviceClient {
   virtual void SetProperty(const dbus::ObjectPath& device_path,
                            const std::string& name,
                            const base::Value& value,
-                           const VoidDBusMethodCallback& callback) = 0;
+                           const base::Closure& callback,
+                           const ErrorCallback& error_callback) = 0;
 
   // Calls ClearProperty method.
   // |callback| is called after the method call finishes.