This test needs to use EventSender instead of initMouseEvent so that the pending fix for 423975 can…

content/test/data/accessibility/event/menulist-popup.html

Index: content/test/data/accessibility/event/menulist-popup.html
diff --git a/content/test/data/accessibility/event/menulist-popup.html b/content/test/data/accessibility/event/menulist-popup.html
index f2d4386c9c33832883b5512dcbd1ba28c4ddfbad..895079a28de539561fff4ff9f30e4365fe991c70 100644
--- a/content/test/data/accessibility/event/menulist-popup.html
+++ b/content/test/data/accessibility/event/menulist-popup.html
@@ -14,9 +14,9 @@
 <script>
   function go() {
     var select = document.querySelector('select');
-    var event = document.createEvent('MouseEvents');
-    event.initMouseEvent('mousedown', true, true, window);
-    select.dispatchEvent(event);
+    var rect = select.options[0].getBoundingClientRect(); 
+    eventSender.mouseMoveTo(rect.left + 1, rect.top + 1); 
+    eventSender.mouseDown(0); 
   }
 </script>
 </body>