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This CL updates the notification displayed when Plugin VM fails to
launch to accommodate both the new error codes, and the unknown error
cases.

A subsequent CL will probably change this notification into a dialog,
so I've temporarily omitted adding screenshots for the strings.

Bug: 1041313
Change-Id: I47b3036d167807cc611bc7d7788acc9669060a44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100453
Commit-Queue: Timothy Loh <timloh@chromium.org>
Reviewed-by: Julian Watson <juwa@google.com>
Cr-Commit-Position: refs/heads/master@{#750492}