Revert "Zone support for Futures."

tests/lib/async/catch_errors13_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 = [];
-  // Work around bug that makes runAsync use Timers. By invoking `runAsync` here
-  // we make sure that asynchronous non-timer events are executed before any
-  // Timer events.
-  runAsync(() { });
-
-  // Test that errors are caught by nested `catchErrors`. Also uses `runAsync`
-  // in the body of a Timer.
-  catchErrors(() {
-    events.add("catch error entry");
-    catchErrors(() {
-      events.add("catch error entry2");
-      Timer.run(() { throw "timer error"; });
-      new Timer(const Duration(milliseconds: 50),
-                () {
-                     runAsync(() { throw "runAsync"; });
-                     throw "delayed error";
-                   });
-    }).listen((x) { events.add(x); })
-      .asFuture()
-      .then((_) => events.add("inner done"))
-      .then((_) { throw "inner done throw"; });
-    events.add("after inner");
-    Timer.run(() { throw "timer outer"; });
-    throw "inner throw";
-  }).listen((x) {
-      events.add(x);
-    },
-    onDone: () {
-      Expect.listEquals([
-                         "catch error entry",
-                         "catch error entry2",
-                         "after inner",
-                         "main exit",
-                         "inner throw",
-                         "timer error",
-                         "timer outer",
-                         "delayed error",
-                         "runAsync",
-                         "inner done",
-                         "inner done throw"
-                         ],
-                         events);
-      port.close();
-    });
-  events.add("main exit");
-}