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The user manager already has access to the cloud print interface, which
contains information about whether cookie based printers are disabled
due to app kiosk mode. Instead of passing the app kiosk information
from the sidebar to the destination settings, allow the user manager to
access the desired information through a getter added to the interface.

Change-Id: I7669d99fcfa2c8228de6dff42fff0e11ce1fb0c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904946
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714752}