Sub chunks for the IP blacklist have no host keys either.

BUG=318533
R=shess@chromium.org

Review URL: https://codereview.chromium.org/68893009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234893 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234893