Don't warn about outdated disabled plugins.
Don't warn about outdated disabled plugins.

BUG=73723
TEST=see bug for manual test

Review URL: http://codereview.chromium.org/6551012

git-svn-id: http://src.chromium.org/svn/trunk/src@75880 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a84afb40c3f0dede738737930a2f59b2fee7d3f7
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