Patch forthcoming.
Created attachment 299949 [details] the patch
Ryosuke: I doubt this is the right fix. Do you know what's going on here?
I talked with Ryosuke and have a fix that he agrees with.
<rdar://problem/30240378>
Created attachment 299958 [details] Patch
Committed r211309: <http://trac.webkit.org/changeset/211309>