Print Preview: Change Pin setting availability.

Make Pin setting unavailable for unmanaged devices and "unsecure" PrintingAllowedPinModes policy value.

Bug: 848942
Change-Id: Id867f203225020b3cec115183de33d9a9f196758
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509832
Commit-Queue: Nikita Podguzov <nikitapodguzov@google.com>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641173}
3 files changed