Multithreaded WebGL is a bad idea - remove it
Feedback from our OpenGL team is that we should never enable this feature.
<rdar://problem/18399858>
Created attachment 238393 [details] Patch
Comment on attachment 238393 [details] Patch r=me. Begone, multithreaded WebGL!
Committed r173776: <http://trac.webkit.org/changeset/173776>