evaluateJavaScriptFunction does not handle undefined input or results right now.
<rdar://problem/25468907>
Created attachment 275304 [details] Patch
Comment on attachment 275304 [details] Patch r=me
Comment on attachment 275304 [details] Patch Clearing flags on attachment: 275304 Committed r198906: <http://trac.webkit.org/changeset/198906>
All reviewed patches have been landed. Closing bug.