Revert "Zone support for Futures."

tests/lib/async/run_zoned5_test.dart

Index: tests/lib/async/run_zoned5_test.dart
diff --git a/tests/lib/async/run_zoned5_test.dart b/tests/lib/async/run_zoned5_test.dart
deleted file mode 100644
index bfe7c8b0afd1c338753b52256b8a08901eb7d6e0..0000000000000000000000000000000000000000
--- a/tests/lib/async/run_zoned5_test.dart
+++ /dev/null
@@ -1,19 +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';
-import 'dart:isolate';
-
-main() {
-  // We keep a ReceivePort open until all tests are done. This way the VM will
-  // hang if the callbacks are not invoked and the test will time out.
-  var port = new ReceivePort();
-  // Ensure that `runZoned`'s onError handles synchronous errors.
-  runZonedExperimental(() { throw 0; },
-                       onError: (e) {
-                         Expect.equals(0, e);
-                         port.close();
-                       });
-}