Remove AsyncError with Expando.

runtime/embedders/openglui/common/gl.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.
 
 library android_extension;
 import 'dart:async';
 
 // A VERY simplified DOM.
 
 class BodyElement {
@@ skipping 196 matching lines @@
       throw new StateError("Subscription has been canceled.");
     }
     // Remove current event listener.
     _unlisten();
 
     _onData = handleData
     _tryResume();
   }
 
   /// Has no effect.
-  void onError(void handleError(AsyncError error)) {}
+  void onError(void handleError(Object error)) {}
 
   /// Has no effect.
   void onDone(void handleDone()) {}
 
   void pause([Future resumeSignal]) {
     if (_canceled) {
       throw new StateError("Subscription has been canceled.");
     }
     ++_pauseCount;
     _unlisten();
@@ skipping 39 matching lines @@
   final Object _target;
   final String _eventType;
 
   _EventStream(this._target, this._eventType);
 
   // DOM events are inherently multi-subscribers.
   Stream<T> asBroadcastStream() => this;
   bool get isBroadcast => true;
 
   StreamSubscription<T> listen(void onData(T event),
-      { void onError(AsyncError error),
+      { void onError(Object error),
       void onDone(),
       bool unsubscribeOnError}) {
 
     return new _EventStreamSubscription<T>(
         this._target, this._eventType, onData);
   }
 }
 
 class Node extends EventTarget {
   Stream<KeyboardEvent> get onKeyDown => new _EventStream(this, 'keydown');
@@ skipping 914 matching lines @@
 
   // TODO(vsm): Kill.
   noSuchMethod(invocation) {
       throw new Exception('Unimplemented/unknown ${invocation.memberName}');
   }
 }
 
 var sfx_extension = 'raw';
 int _loadSample(String s) native "LoadSample";
 int _playSample(String s) native "PlaySample";