Revert https://code.google.com/p/dart/source/detail?r=33346

pkg/unittest/test/unittest_completion_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 unittestTest;
 import 'dart:isolate';
 import 'dart:async';
 import 'package:unittest/unittest.dart';
 
 part 'unittest_test_utils.dart';
 
 var testName = 'completion test';
 
 var testFunction = (TestConfiguration testConfig) {
   test(testName, () {
     var _callback;
-    _callback = expectAsyncUntil(() {
+    _callback = expectAsyncUntil0(() {
       if (++testConfig.count < 10) {
         _defer(_callback);
       }
     },
     () => (testConfig.count == 10));
     _defer(_callback);
   });
 };
 
 var expected = buildStatusString(1, 0, 0, testName, count: 10);