Fix options for calling push-to-trunk script.

BUG=
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/209833002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20173 ce2b1a6d-e550-0410-aec6-3dcde31c8c00