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According to the latest mocks we need to show a notification instead
of a toast when printing is blocked due to Data Leak Prevention
configuration.
See mocks: https://docs.google.com/presentation/d/1v0GM-lwHCznFJ6hnZlUH37eBOuAkJMw5Q6UnSkcKOgA/edit?hl=en#slide=id.ga3a0b63111_0_321

Bug: 1124651
Change-Id: I3bf1f73610d2f2723f75b9801bb131c7b2bf77b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505790Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822106}