Dart: Refactors Proxies

examples/dart/hello_world/hello/lib/main.dart

Index: examples/dart/hello_world/hello/lib/main.dart
diff --git a/examples/dart/hello_world/hello/lib/main.dart b/examples/dart/hello_world/hello/lib/main.dart
index 19c0e0e72a115ff9603c7fa79f960932c6eddcaa..008948446ae0f04190b4a9d8e0bb42f5eaac14e7 100644
--- a/examples/dart/hello_world/hello/lib/main.dart
+++ b/examples/dart/hello_world/hello/lib/main.dart
@@ -29,7 +29,7 @@ class Hello extends Application {
     // app has a chance to come up. Instead, we wait to close this app until
     // the "world" app comes up, does its print, and closes its end of the
     // connection.
-    c.remoteServiceProvider.impl.onError = closeApplication;
+    c.remoteServiceProvider.ctrl.onError = closeApplication;
   }
 
   Future closeApplication(e) async {