Remove support for attribute event listeners.

client/dom/generated/src/wrapping/_WorkerContextWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 // WARNING: Do not edit - generated code.
 
 class _WorkerContextWrappingImplementation extends DOMWrapperBase implements WorkerContext {
   _WorkerContextWrappingImplementation() : super() {}
 
   static create__WorkerContextWrappingImplementation() native {
     return new _WorkerContextWrappingImplementation();
   }
 
   WorkerLocation get location() { return _get_location(this); }
   static WorkerLocation _get_location(var _this) native;
 
   void set location(WorkerLocation value) { _set_location(this, value); }
   static void _set_location(var _this, WorkerLocation value) native;
 
   WorkerNavigator get navigator() { return _get_navigator(this); }
   static WorkerNavigator _get_navigator(var _this) native;
 
   void set navigator(WorkerNavigator value) { _set_navigator(this, value); }
   static void _set_navigator(var _this, WorkerNavigator value) native;
 
-  EventListener get onerror() { return _get_onerror(this); }
-  static EventListener _get_onerror(var _this) native;
-
-  void set onerror(EventListener value) { _set_onerror(this, value); }
-  static void _set_onerror(var _this, EventListener value) native;
-
   WorkerContext get self() { return _get_self(this); }
   static WorkerContext _get_self(var _this) native;
 
   void set self(WorkerContext value) { _set_self(this, value); }
   static void _set_self(var _this, WorkerContext value) native;
 
   NotificationCenter get webkitNotifications() { return _get_webkitNotifications(this); }
   static NotificationCenter _get_webkitNotifications(var _this) native;
 
   DOMURL get webkitURL() { return _get_webkitURL(this); }
@@ skipping 57 matching lines @@
   }
   static int _setInterval(receiver, handler, timeout) native;
 
   int setTimeout(TimeoutHandler handler, int timeout) {
     return _setTimeout(this, handler, timeout);
   }
   static int _setTimeout(receiver, handler, timeout) native;
 
   String get typeName() { return "WorkerContext"; }
 }