This reverts commit 6b7c5ba5353e2a81255879173de758fc5f08be62.
Unfortunately it seems like this broke slim, lightdm and gdm (see #25068
and #23264). This is already reverted in the 17.03 branch (99dfb6d).
TODO: We need tests for slim and lightdm and fix the test for gdm
(failing since 2016-10-26) to prevent such breakage in the future.