According to the latest spec, event listeners can only be set after the Notification has been created. A previous version allowed them to be set in the options dictionary. http://dvcs.w3.org/hg/notifications/raw-file/tip/Overview.html#api
<rdar://problem/12213901>
Created attachment 161768 [details] Patch
Committed r128080: <http://trac.webkit.org/changeset/128080>