GitLab

Add uninstall menu option to Crostini apps that can be uninstalled from
the container.

BUG=chromium:822514
TEST=Apps from .desktop files associated with a package now have
'uninstall' on right-click menu; Apps from .desktop files I created do
not have 'uninstall'

R=timloh@chromium.org

Change-Id: If7bcd69c08a806b98a4200d2de7ca4f550c57c21
Reviewed-on: https://chromium-review.googlesource.com/c/1213519
Commit-Queue: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612850}