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The current situation of boolean policy switches either enabling or
disabling something is pretty arbitrary (although tending to be the
inverse of the browser default). It's much easier to reason about
XYZEnabled-style settings, so we prefer those going forward.

BUG=chromium:85687
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10829197

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150333 0039d316-1c4b-4281-b951-d872f2087c98