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The test was only relevant to SingleProcessMash, which was cancelled.
The teardown flow it tests shouldn't happen any more.

Bug: 922293
Test: ash_unittests
Change-Id: Iabd150315ae4f0618462924a379108832530bd69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752540
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686570}