This reverts commit r20932 for breaking Mac build.

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/251383003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20933 ce2b1a6d-e550-0410-aec6-3dcde31c8c00