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It is possible for Crostini apps to be disallowed by policy. This can change
at any time for a give machine, so we always need to check.

While the pinning bug is still happening, we also need this as a failsafe.

Bug: 881681
Change-Id: I2e2497ef9cdaee7f989d38931a88886d52535cf9
Reviewed-on: https://chromium-review.googlesource.com/1212373Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589441}