Migrated test block 171 to Dart 2.0.

tests/lib/async/run_zoned4_test.dart

Index: tests/lib/async/run_zoned4_test.dart
diff --git a/tests/lib/async/run_zoned4_test.dart b/tests/lib/async/run_zoned4_test.dart
deleted file mode 100644
index 9df955e201ac1ef5f5a5367f922ff5d9b3c2d261..0000000000000000000000000000000000000000
--- a/tests/lib/async/run_zoned4_test.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// 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';
-
-main() {
-  // Make sure `runZoned` returns the result of a synchronous call when an
-  // error handler is defined.
-  Expect.equals(
-      499,
-      runZoned(() => 499, onError: (e) {
-        throw "Unexpected";
-      }));
-}