Re-enable C++11 tests (still not on VS or NaCL).

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/457593002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22989 ce2b1a6d-e550-0410-aec6-3dcde31c8c00