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If plugin vm is installed, we show it in settings page even if policy
does not allow it so that the user can still uninstall it. But we should
not show it if the user logs in as a non-primary user because they can
still uninstall it when re-login as a primary user.

Bug: b/155954630
Test: manually
Change-Id: I34ca261c929f5d3e1d3c2b1dc145e679fd6d30f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275978
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785303}