Fix in webui needed from API change in dart:html

lib/src/analyzer.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.
 
 /**
  * Part of the template compilation that concerns with extracting information
  * from the HTML parse tree.
  */
 library analyzer;
 
@@ skipping 477 matching lines @@
       _messages.warning('Event handler $name will be interpreted as an inline '
           'JavaScript event handler. Use the form '
           'on-event-name="handlerName(\$event)" if you want a Dart handler '
           'that will automatically update the UI based on model changes.',
           info.node.sourceSpan);
       return;
     }
 
     if (name == 'on-key-down' || name == 'on-key-up' ||
         name == 'on-key-press') {
-      value = '\$event = new autogenerated.KeyEvent(\$event); $value';
+      value = '\$event = new autogenerated.KeyEvent.wrap(\$event); $value';
     }
 
     _addEvent(info, toCamelCase(name), (elem) => value);
     info.removeAttributes.add(name);
   }
 
   EventInfo _addEvent(ElementInfo info, String name, ActionDefinition action) {
     var events = info.events.putIfAbsent(name, () => <EventInfo>[]);
     var eventInfo = new EventInfo(name, action);
     events.add(eventInfo);
@@ skipping 725 matching lines @@
               }
             }
           }
         }
       }
     }
 
     return seen;
   }
 }