Adapt Webkit test expectations to r18480.

R=jkummerow@chromium.org
LOG=N
BUG=v8:3082
TEST=webkit/fast/js/Object-getOwnPropertyNames

Review URL: https://codereview.chromium.org/127853002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18481 ce2b1a6d-e550-0410-aec6-3dcde31c8c00