GitLab

The flag is: RemoveSupervisedUsersOnStartup.
It is disabled by default.

The tests in this CL verify that when the feature is disabled, no users
are removed, and when the feature is enabled, *only* the Supervised
users are removed.

Bug: 916685
Change-Id: I32882e786f457a27368724415b65e6a428e4b70b
Reviewed-on: https://chromium-review.googlesource.com/c/1384934Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Danan S <danan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626865}