Filter untrusted policy values coming from GPO.

For now this only handles force-installed extensions that are not coming
from the Chrome Web Store directly.

BUG=none

Review URL: https://codereview.chromium.org/153633004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248957 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248957
Move kDisablePasswordAutofillPublicSuffixDomainMatching to components

The purpose is to drop the dependency of psl_matching_helper.* on chrome.

BUG=334662
R=blundell@chromium.org, gcasto@chromium.org
TBR=joi@chromium.org, zea@chromium.org

Review URL: https://codereview.chromium.org/153803004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248958 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248958