This fixes a bug introduced in r20179.

R=jkummerow@chromium.org
BUG=356211
LOG=N

Review URL: https://codereview.chromium.org/213193011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20292 ce2b1a6d-e550-0410-aec6-3dcde31c8c00