Migrated test block 168 to Dart 2.0.

tests/lib_strong/async/catch_errors_test.dart

Index: tests/lib_strong/async/catch_errors_test.dart
diff --git a/tests/lib_strong/async/catch_errors_test.dart b/tests/lib_strong/async/catch_errors_test.dart
deleted file mode 100644
index 10ddb90582c5dda7261b035661310364fa4472e8..0000000000000000000000000000000000000000
--- a/tests/lib_strong/async/catch_errors_test.dart
+++ /dev/null
@@ -1,22 +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:async_helper/async_helper.dart';
-import "package:expect/expect.dart";
-import 'dart:async';
-import 'catch_errors.dart';
-
-main() {
-  asyncStart();
-
-  // Make sure `catchErrors` does not execute the error callback.
-  catchErrors(() {
-    return 'allDone';
-  }).listen((x) {
-    Expect.fail("Unexpected callback");
-  });
-
-  // Wait one cycle before shutting down the test.
-  Timer.run(asyncEnd);
-}