Remove support for attribute event listeners.

client/dom/generated/src/wrapping/_IDBVersionChangeRequestWrappingImplementation.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 _IDBVersionChangeRequestWrappingImplementation extends _IDBRequestWrappingImplementation implements IDBVersionChangeRequest {
   _IDBVersionChangeRequestWrappingImplementation() : super() {}
 
   static create__IDBVersionChangeRequestWrappingImplementation() native {
     return new _IDBVersionChangeRequestWrappingImplementation();
   }
 
-  EventListener get onblocked() { return _get_onblocked(this); }
-  static EventListener _get_onblocked(var _this) native;
-
-  void set onblocked(EventListener value) { _set_onblocked(this, value); }
-  static void _set_onblocked(var _this, EventListener value) native;
-
   String get typeName() { return "IDBVersionChangeRequest"; }
 }