This change caused errors in es5conform tests for getPrototypeOf.

TBR=rossberg@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7109004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8159 ce2b1a6d-e550-0410-aec6-3dcde31c8c00