bug 116796 crash with immersion desktop running, qi'd to an interface that wasn't defined in the xbl

r=aaronl,hewitt
sr=waterson


git-svn-id: svn://10.0.0.236/trunk@111717 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/xpfe/global/resources/content/bindings/menu.xml

@@ -8,7 +8,7 @@
     <resources>
       <stylesheet src="chrome://global/skin/menu.css"/>
     </resources>
-    <implementation implements="nsIAccessibleProvider">
+    <implementation implements="nsIDOMXULSelectControlItemElement, nsIAccessibleProvider">
       <property name="accessible">
         <getter>
           <![CDATA[