Mark two failing mozilla tests as failing.

They started to fail after turning on i18n support. Need to investigate
why

BUG=v8:2893
TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23705008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16786 ce2b1a6d-e550-0410-aec6-3dcde31c8c00