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Mustash/mash was shut down over a year ago. However, the checks for
ash::Shell::HasInstance() are still needed for tests.

Bug: none
Change-Id: I8164a5b36c1d77286e4a092c9a5f6c4cf33878f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225377
Auto-Submit: James Cook <jamescook@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773962}