Dart: Removes need to call listen().

mojo/dart/embedder/test/dart_to_cpp_tests.dart

Index: mojo/dart/embedder/test/dart_to_cpp_tests.dart
diff --git a/mojo/dart/embedder/test/dart_to_cpp_tests.dart b/mojo/dart/embedder/test/dart_to_cpp_tests.dart
index f9621ae01502539f8c4734c498b760f914d952e0..d2e70d6a24e3e019e893d36cf7f4467b98bd9148 100644
--- a/mojo/dart/embedder/test/dart_to_cpp_tests.dart
+++ b/mojo/dart/embedder/test/dart_to_cpp_tests.dart
@@ -22,7 +22,7 @@ class DartSideImpl implements DartSide {
   Completer _completer;
 
   DartSideImpl(core.MojoMessagePipeEndpoint endpoint) {
-    _stub = new DartSideStub.fromEndpoint(endpoint, impl: this);
+    _stub = new DartSideStub.fromEndpoint(endpoint, this);
     _sampleData = new Uint8List(CAPACITY_BYTES);
     for (int i = 0; i < _sampleData.length; ++i) {
       _sampleData[i] = i;
@@ -107,7 +107,6 @@ class DartSideImpl implements DartSide {
   Future<bool> get future => _completer.future;
 }
 
-
 main(List args) {
   assert(args.length == 2);
   int mojoHandle = args[0];