Revert "Zone support for Futures."

tests/lib/async/catch_errors14_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 '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 = [];
-  // Test that periodic Timers are handled correctly by `catchErrors`.
-  catchErrors(() {
-    int counter = 0;
-    new Timer.periodic(const Duration(milliseconds: 50), (timer) {
-      if (counter++ == 5) timer.cancel();
-      throw "error $counter";
-    });
-  }).listen((x) {
-      events.add(x);
-    },
-    onDone: () {
-      Expect.listEquals([
-                         "main exit",
-                         "error 1",
-                         "error 2",
-                         "error 3",
-                         "error 4",
-                         "error 5",
-                         "error 6",
-                         ],
-                         events);
-      port.close();
-    });
-  events.add("main exit");
-}