Drop the code allowing privacy blacklists to be shipped in extensions.

The plan is to implement it in a different way.

TEST=Covered by unit_tests.
BUG=21541

Review URL: http://codereview.chromium.org/552025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36626 0039d316-1c4b-4281-b951-d872f2087c98
39 files changed