This converts the Shill clients to allow propagation of shill errors

chromeos/dbus/dbus_method_call_status.h

Index: chromeos/dbus/dbus_method_call_status.h
diff --git a/chromeos/dbus/dbus_method_call_status.h b/chromeos/dbus/dbus_method_call_status.h
index a45611ebc8af220649f276e3408fb0d92f4373a2..29fa84f4ac0c60fcf17537ca7138248443d0f717 100644
--- a/chromeos/dbus/dbus_method_call_status.h
+++ b/chromeos/dbus/dbus_method_call_status.h
@@ -39,6 +39,10 @@ typedef base::Callback<void(
     DBusMethodCallStatus call_status,
     const dbus::ObjectPath& result)> ObjectPathDBusMethodCallback;
 
+// A callback to handle responses of methods returning a ObjectPath value that
+// doens't get call status.
+typedef base::Callback<void(const dbus::ObjectPath& result)> ObjectPathCallback;
+
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_DBUS_METHOD_CALL_STATUS_H_