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In this change we're adding a test that simulates the same condition
that was addressed in https://crrev.com/c/2389060 i.e. we ensure that
ArcInstanceStopped is not called on new instances of arc_vm_client_adapter
if they're created during handling of ArcInstanceStopped event.

BUG=b:164816080
TEST=components_unittests --gtest_filter='ArcVmClientAdapterTest*'
TEST=revert the fix and ensure that the test fails

Change-Id: Icd90da53f832d13893f20bb017fdc793e14af628
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469813Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817545}