Add strings for blacklist states.

BUG=267514
R=kalman@chromium.org

Review URL: https://codereview.chromium.org/45953003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232392 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232392