Revert "Zone support for Futures."

tests/lib/async/catch_errors16_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 = [];
-  StreamController controller = new StreamController();
-  Stream stream = controller.stream;
-  // Test that the subscription of a stream is what counts. The error (2) runs
-  // through the map-stream which goes through the nested `catchError` but
-  // the nested `catchError` won't see the error.
-  catchErrors(() {
-    stream = stream.map((x) => x + 100);
-  }).listen((x) { events.add(x); });
-  stream
-    .transform(new StreamTransformer(
-        handleError: (e, sink) => sink.add("error $e")))
-    .listen((x) { events.add("stream $x"); },
-            onDone: () {
-              Expect.listEquals(["stream 101",
-                                "stream error 2",
-                                ],
-                                events);
-              port.close();
-            });
-  controller.add(1);
-  controller.addError(2);
-  controller.close();
-}