Fix build after r18344

"log" is an overloaded function, it cannot be resolved without explicit parameter type information

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/117723004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00