Dart: Refactor Stubs

mojo/dart/apptests/test_apps/pingpong/lib/main.dart

Index: mojo/dart/apptests/test_apps/pingpong/lib/main.dart
diff --git a/mojo/dart/apptests/test_apps/pingpong/lib/main.dart b/mojo/dart/apptests/test_apps/pingpong/lib/main.dart
index e450290812bc727ed30066ead355ba33e6c6ccd8..1787e15f448525a869195eceb774e8d98b3c98b1 100644
--- a/mojo/dart/apptests/test_apps/pingpong/lib/main.dart
+++ b/mojo/dart/apptests/test_apps/pingpong/lib/main.dart
@@ -102,7 +102,7 @@ class PingPongServiceImpl implements PingPongService {
 
   getPingPongServiceDelayed(PingPongServiceStub serviceStub) {
     Timer.run(() {
-      var endpoint = serviceStub.unbind();
+      var endpoint = serviceStub.ctrl.unbind();
       new Timer(const Duration(milliseconds: 10), () {
         var targetServiceProxy = new PingPongServiceProxy.unbound();
         _application.connectToService(
@@ -110,7 +110,7 @@ class PingPongServiceImpl implements PingPongService {
 
         // Pass along the interface request to another implementation of the
         // service.
-        serviceStub.bind(endpoint);
+        serviceStub.ctrl.bind(endpoint);
         targetServiceProxy.getPingPongService(serviceStub);
         targetServiceProxy.close();
       });