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The mustash team is deprecating the current implementation of mus mode
(mojo window service on a background thread in the browser process).
We don't need to test this configuration any more.

Later CLs will clean up the test suite C++ code.

Bug: 838597
Change-Id: I1198adcb6e105f3c326f47356b5551221663ad0f
Reviewed-on: https://chromium-review.googlesource.com/1037663Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555220}