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This CL skips parts of the uninstall flow if the Termina VM was not
installed. This occurs if installation and uninstallation occurs
offline.

BUG=884284

Change-Id: I7e669605844b0914948bde792f67891e55ad0e7a
Reviewed-on: https://chromium-review.googlesource.com/1233016Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Josh Pratt <jopra@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593787}