Enable deprecatations (again).

Hopefully we will win the race this time...

BUG=v8:2487

Review URL: https://codereview.chromium.org/12554004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13878 ce2b1a6d-e550-0410-aec6-3dcde31c8c00