Fix compilation error introduced by r18363.

Remove debugging related code.

TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/104793005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18364 ce2b1a6d-e550-0410-aec6-3dcde31c8c00