This will allow to modify test expectation for system==windows.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/24528003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16941 ce2b1a6d-e550-0410-aec6-3dcde31c8c00