Make sure DISABLE_NOT_VERIFIED label shows also when not in dev mode on chrome://extensions.

BUG=320496

Review URL: https://codereview.chromium.org/59873009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236246 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236246