veyron2/ipc: 4 of n. 'Invoker and Signature' rationalisation.

- first CL to remove use of ReflectInvoker from our app code.

Change-Id: Ia2ef1ae14f248fa16c4f798d8fc68136c0e1d017
diff --git a/tools/profile/impl_test.go b/tools/profile/impl_test.go
index fde8b26..a739a15 100644
--- a/tools/profile/impl_test.go
+++ b/tools/profile/impl_test.go
@@ -80,8 +80,7 @@
 }
 
 func (d *dispatcher) Lookup(suffix, method string) (interface{}, security.Authorizer, error) {
-	invoker := ipc.ReflectInvoker(repository.ProfileServer(&server{suffix: suffix}))
-	return invoker, nil, nil
+	return repository.ProfileServer(&server{suffix: suffix}), nil, nil
 }
 
 func startServer(t *testing.T, r veyron2.Runtime) (ipc.Server, naming.Endpoint, error) {