This really can cause crash described in crbug/51919.

BUG=51919
TEST=NONE

Review URL: http://codereview.chromium.org/3334001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5391 ce2b1a6d-e550-0410-aec6-3dcde31c8c00