Dart: Removes need to call listen().

services/dart/test/echo/main.dart

Index: services/dart/test/echo/main.dart
diff --git a/services/dart/test/echo/main.dart b/services/dart/test/echo/main.dart
index 5d32fb2bff9cfe9c2e5c760c64a058b2c69bdd52..f786c58b7d8d75e7f514e74483e7ed73a2294a5f 100644
--- a/services/dart/test/echo/main.dart
+++ b/services/dart/test/echo/main.dart
@@ -13,9 +13,8 @@ class EchoServiceImpl implements EchoService {
   EchoServiceStub _stub;
   Application _application;
 
-  EchoServiceImpl(Application application, MojoMessagePipeEndpoint endpoint)
-      : _application = application {
-    _stub = new EchoServiceStub.fromEndpoint(endpoint, impl: this);
+  EchoServiceImpl(this._application, MojoMessagePipeEndpoint endpoint) {
+    _stub = new EchoServiceStub.fromEndpoint(endpoint, this);
   }
 
   echoString(String value, Function responseFactory) {
@@ -32,10 +31,8 @@ class EchoApplication extends Application {
   @override
   void acceptConnection(String requestorUrl, String resolvedUrl,
       ApplicationConnection connection) {
-    connection.provideService(
-        EchoServiceName,
+    connection.provideService(EchoServiceName,
         (endpoint) => new EchoServiceImpl(this, endpoint));
-    connection.listen();
   }
 }