roll-chromium-deps doesn't roll DEPS
https://bugs.webkit.org/show_bug.cgi?id=114421

Reviewed by Antti Koivisto.

Roll DEPS. Rolling DEPS. Rolled DEPS.

* Scripts/webkitpy/tool/bot/irc_command.py:
(RollChromiumDEPS.execute):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148184 268f45cc-cd09-0410-ab3c-d52691b4dbfc