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Currently, if the user creates addition non-default containers and then
uninstalls crostini, and apps in those non-default containers will
continue to show up in the app launcher. This CL changes this behaviour
to remove all apps associated with the default VM instead.

Change-Id: Ieaa1ea6c434480cd5a2e4dfe7b05eb497ffc9917
Bug: 921163
Reviewed-on: https://chromium-review.googlesource.com/c/1429359Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#626912}