Revert "Make the metrics library respect the policy settings instead of the consent file."

This reverts commit 6a294b4a3e9aa69dc9c429ed398e9dd7615029f2

Change-Id: I7d80b119d4e2b880f75c2293770e073785764e7d
Reviewed-on: http://gerrit.chromium.org/gerrit/4509


Reviewed-by: Ken Mixter <kmixter@chromium.org>
Tested-by: Ken Mixter <kmixter@chromium.org>