Migrated test block 170 to Dart 2.0.

tests/lib_2/async/intercept_schedule_microtask2_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:expect/expect.dart";
 import 'dart:async';
 import 'catch_errors.dart';
 
 var events = [];
 
@@ skipping 12 matching lines @@
 }
 
 main() {
   // Test that scheduleMicrotask interception works.
   var result = runZonedScheduleMicrotask(body, onScheduleMicrotask: handler);
   // No need for a ReceivePort: If the runZonedScheduleMicrotask misbehaved we
   // would have an [events] list that is different from what we expect.
   Expect.listEquals(
       ["body entry", "handler", "run async body", "handler done"], events);
 }