Compile fix for NaCL

TBR=mstarzinger@chromium.org
BUG=none
LOG=n

Review URL: https://codereview.chromium.org/228953002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20584 ce2b1a6d-e550-0410-aec6-3dcde31c8c00