Refactor the event-generation code to locate it in systemhtml.py.

client/html/generated/html/dartium/DOMApplicationCache.dart

 
 class _DOMApplicationCacheImpl extends _EventTargetImpl implements DOMApplicationCache {
   _DOMApplicationCacheImpl._wrap(ptr) : super._wrap(ptr);
 
-  int get status() => _wrap(_ptr.status);
-
   _DOMApplicationCacheEventsImpl get on() {
     if (_on == null) _on = new _DOMApplicationCacheEventsImpl(this);
     return _on;
   }
 
+  int get status() => _wrap(_ptr.status);
+
   void abort() {
     _ptr.abort();
     return;
   }
 
   void _addEventListener(String type, EventListener listener, [bool useCapture = null]) {
     if (useCapture === null) {
       _ptr.addEventListener(_unwrap(type), _unwrap(listener));
       return;
     } else {
@@ skipping 39 matching lines @@
   EventListenerList get error() => _get('error');
 
   EventListenerList get noUpdate() => _get('noupdate');
 
   EventListenerList get obsolete() => _get('obsolete');
 
   EventListenerList get progress() => _get('progress');
 
   EventListenerList get updateReady() => _get('updateready');
 }