We can remove this indirection now that V8 is gone.
Created attachment 196751 [details] Proposed Change
https://trac.webkit.org/r147861
We get this failure after the patch: http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK2%20(Tests)/r147863%20(8595)/platform/mac-wk2/plugins/mouse-events-scaled-iframe-pretty-diff.html Needs rebaseline?
I don't see how my change caused this.