Migrated test block 167 to Dart 2.0.

tests/lib_2/async/catch_errors22_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.
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'catch_errors.dart';
 
 main() {
@@ skipping 28 matching lines @@
     Expect.isFalse(onDoneWasCalled);
     Expect.listEquals([
       "caught: 1",
       "caught: 2",
       "caught: 3",
       "caught: 4",
     ], events);
     asyncEnd();
   });
 }