Revert "Zone support for Futures."

tests/lib/async/catch_errors23_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;
-  Stream stream;
-  // Test that errors are not traversing zone boundaries.
-  // Note that the first listener of `asBroadcastStream` determines in which
-  // zone the subscription lives.
-  catchErrors(() {
-    catchErrors(() {
-      controller = new StreamController();
-      stream = controller.stream
-        .map((x) {
-          events.add("map $x");
-          return x + 100;
-        })
-        .transform(new StreamTransformer(
-            handleError: (e, sink) => sink.add("error $e")))
-        .asBroadcastStream();
-      stream.listen((x) { events.add("stream $x"); });
-    }).listen((x) { events.add(x); })
-      .asFuture().then((_) { events.add("inner done"); });
-    stream.listen((x) { events.add("stream2 $x"); });
-    controller.add(1);
-    // Errors are not allowed to traverse boundaries. This error should be
-    // caught by the outer catchErrors.
-    controller.addError(2);
-    controller.close();
-  }).listen((x) { events.add("outer: $x"); },
-            onDone: () {
-              Expect.listEquals(["map 1",
-                                "stream 101",
-                                "stream2 101",
-                                "outer: 2",
-                                "inner done",
-                                ],
-                                events);
-              port.close();
-            });
-}