This reverts r25155.

Reason: breaks webkit unit tests.

BUG=
TBR=marja@chromium.org

Review URL: https://codereview.chromium.org/707483002

Cr-Commit-Position: refs/heads/master@{#25159}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25159 ce2b1a6d-e550-0410-aec6-3dcde31c8c00