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This is a reland of 4bf05b95 with
updated ArcVmClientAdapterTest unitests.

Original change's description:
> arc: Only call StopVm() if ARCVM is running
>
> This change adds a check in ArcVmClientAdapter::StopArcInstance() to see
> if a VM is running (current_cid_ is set). If not, skip calling
> ConciergeClient::StopVm() and notify observers that ARCVM is stopped
> right away.
>
> BUG=b:169893632
> TEST=arc.AuthPerf.unmanaged_vm
>
> Change-Id: Ic927f122cacea0e89cacffbbcd67a217772dba43
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462573
> Commit-Queue: Willie Koomson <wvk@google.com>
> Reviewed-by: Yusuke Sato <yusukes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#816221}

BUG=b:169893632
TEST=components_unittests --gtest_filter="ArcVmClientAdapterTest.*"

Change-Id: I3f9440333f7339687e3a4bd36799de06376b9351
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466559Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Willie Koomson <wvk@google.com>
Cr-Commit-Position: refs/heads/master@{#816649}