It seems that all ports in WebKit don't support it. And this patch removes all things related to this protocol in Frontend.
<rdar://problem/15733380>
Created attachment 220135 [details] Patch
Comment on attachment 220135 [details] Patch Attachment 220135 [details] did not pass efl-wk2-ews (efl-wk2): Output: http://webkit-queues.appspot.com/results/5540723902382080
Created attachment 220142 [details] Patch
Comment on attachment 220142 [details] Patch r=me, thanks
Comment on attachment 220142 [details] Patch Clearing flags on attachment: 220142 Committed r161380: <http://trac.webkit.org/changeset/161380>
All reviewed patches have been landed. Closing bug.