Revert "Zone support for Futures."

sdk/lib/async/stream_controller.dart

 // Copyright (c) 2012, 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.
 
 part of dart.async;
 
 // -------------------------------------------------------------------
 // Controller for creating and adding events to a stream.
 // -------------------------------------------------------------------
 
@@ skipping 339 matching lines @@
   }
 }
 
 typedef void _NotificationHandler();
 
 void _runGuarded(_NotificationHandler notificationHandler) {
   if (notificationHandler == null) return;
   try {
     notificationHandler();
   } catch (e, s) {
-    _Zone.current.handleUncaughtError(_asyncError(e, s));
+    _throwDelayed(e, s);
   }
 }
 
 class _ControllerStream<T> extends _StreamImpl<T> {
   _StreamControllerLifecycle<T> _controller;
   bool _hasListener = false;
 
   _ControllerStream(this._controller);
 
   StreamSubscription<T> _createSubscription(
@@ skipping 394 matching lines @@
   }
 
   void _callOnCancel() {
     if (_hasPending) {
       _pending.clear();
       _pending = null;
     }
     super._callOnCancel();
   }
 }