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And use it to clean up registered apps before uninstalling Crostini.

Change-Id: I4331d3ca30f136f0880e9e886cad12e8fe9802ad
Reviewed-on: https://chromium-review.googlesource.com/1032672Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Renée Wright <rjwright@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554644}