Move the Autofill and URLBlacklist policy handlers to the component.

All the dependencies of these policy handlers have already been moved into
the policy component, and they can now be moved as well. This enables their
usage on ios builds.

BUG=275292

Review URL: https://codereview.chromium.org/140803003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245522 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245522