Port r18945 (699b03e)

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/145083018

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18960 ce2b1a6d-e550-0410-aec6-3dcde31c8c00