build fix for 14530

TBR=svenpanne@chromium.org
BUG=
TEST=

Review URL: https://codereview.chromium.org/14881002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14532 ce2b1a6d-e550-0410-aec6-3dcde31c8c00