GitLab

ChromeOsReleaseChannel is only honored if
ChromeOsReleaseChannelDelegated is False and the release channel on
devices can only be switched if ChromeOsReleaseChannel is set to True.

Update comments and policy description to match the behavior.

Bug: 1147003
Change-Id: I72436eb3d50df9755c88aeec17b099e2a3d26b23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549923Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Miriam Polzer <mpolzer@google.com>
Cr-Commit-Position: refs/heads/master@{#829595}