The type of key code in Brew MP is uint16. Take uint16 instead of int16 in keyIdentifierForBrewKeyCode.
Created attachment 67964 [details] Patch
Comment on attachment 67964 [details] Patch r=me
Comment on attachment 67964 [details] Patch Clearing flags on attachment: 67964 Committed r67794: <http://trac.webkit.org/changeset/67794>
All reviewed patches have been landed. Closing bug.