Unreviewed.  Rolled Chromium DEPS to r186991.  Requested by
"James Robinson" <jamesr@chromium.org> via sheriffbot.

Patch by Sheriff Bot <webkit.review.bot@gmail.com> on 2013-03-08

* DEPS:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145252 268f45cc-cd09-0410-ab3c-d52691b4dbfc