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Refactor CrostiniApps and GuestOsRegistryService so that PluginVM apps
are registered as type PluginVm by PluginVmApps.

When I recently changed the icon handling, it was a mistake to register
PluginVM apps as crostini.

Bug: b/158617133
Change-Id: I0877e75b9b087c6ece34cbe8642399b5cc2764c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379407Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802940}