Revert "Zone support for Futures."

tests/lib/async/catch_errors18_test.dart

Index: tests/lib/async/catch_errors18_test.dart
diff --git a/tests/lib/async/catch_errors18_test.dart b/tests/lib/async/catch_errors18_test.dart
deleted file mode 100644
index 33e60ab03a63215305f60acd1ed71be91bf214b3..0000000000000000000000000000000000000000
--- a/tests/lib/async/catch_errors18_test.dart
+++ /dev/null
@@ -1,33 +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';
-import 'catch_errors.dart';
-
-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();
-  var events = [];
-  Stream stream = new Stream.periodic(const Duration(milliseconds: 20),
-                                      (x) => x);
-  // Test that errors of periodic streams are caught.
-  catchErrors(() {
-    var subscription;
-    subscription = stream.listen((x) {
-      if (x == 5) {
-        events.add("cancel");
-        subscription.cancel();
-        return;
-      }
-      events.add(x);
-    });
-  }).listen((x) { events.add("outer: $x"); },
-            onDone: () {
-              Expect.listEquals([0, 1, 2, 3, 4, "cancel"], events);
-              port.close();
-            });
-}