It is enabled on all ports long time ago and Saam suggested to remove in in bug157513. Let me know if you have concerns or if you think it would be better to discuss it on webkit-dev too.
Created attachment 278611 [details] Patch
r=me too
Comment on attachment 278611 [details] Patch Clearing flags on attachment: 278611 Committed r200747: <http://trac.webkit.org/changeset/200747>
All reviewed patches have been landed. Closing bug.