Tighten down DEPS allowances in //components/autofill.

These allowances don't actually require any refactorings to tighten down.

BUG=247015

Review URL: https://codereview.chromium.org/25381005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226277 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226277