Cause experimental builds to uninstall unconditionally with no UI.
Cause experimental builds to uninstall unconditionally with no UI.

Review URL: http://codereview.chromium.org/203059

git-svn-id: http://src.chromium.org/svn/trunk/src@26179 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8b3f06a0a8cd7becb2d6ee280919585372edcaca
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser