Last time I checked ...
Webkit was part of Apple WebCore, and Webkit itself is part of the KDE Konquerer web browser.
Credit where credit is due... Especially as apple's upstream patches to webkit are always huge, skewed and withouth proper documentation, only apply to earlier versions that apple patch ed against report huge errors on apply (patch already applied, hunk failed etc...) and are therefore fairly uselss.
If you mean to say the KDE webkit then please, update ;)