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..6cbe7d96cb1a7e62d61081f61bb005148e15de2c 100644
--- a/chromeos/dbus/dbus_method_call_status.h
+++ b/chromeos/dbus/dbus_method_call_status.h
@@ -37,7 +37,12 @@ typedef base::Callback<void(
 // A callback to handle responses of methods returning a ObjectPath value.
 typedef base::Callback<void(
     DBusMethodCallStatus call_status,
-    const dbus::ObjectPath& result)> ObjectPathDBusMethodCallback;
+    const dbus::ObjectPath& result)> ObjectPathCallback;
+
+// 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)> ObjectPathCallbackWithoutStatus;
 
 }  // namespace chromeos