Upgrading tests with unittest deprecations

tests/html/worker_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library worker_test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
@@ skipping 19 matching lines @@
 
     if (!Worker.supported) {
       return;
     }
 
     test('works', () {
       // Use Blob to make a local URL so we don't have to have a separate file.
       var blob = new Blob([workerScript], 'text/javascript');
       var url = Url.createObjectUrl(blob);
       var worker = new Worker(url);
-      var test = expectAsync1((e) {
+      var test = expectAsync((e) {
         expect(e.data, 'WorkerMessage');
       });
       worker.onMessage.first.then(test);
     });
   });
 }