GitLab

Note that this CL does not hook the blacklist with the disabling of the feature.  Will do that in another CL.

BUG=139683
TEST=unit_tests
TBR=jam
Review URL: https://chromiumcodereview.appspot.com/10831081

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149275 0039d316-1c4b-4281-b951-d872f2087c98