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During the conversion to ws2 a handful of aura unittests got an early out.
This adds comments as to why these tests fail with MUS, and updates one to
work with MUS. For the ones I didn't update I didn't feel fixing the test was
worth it, given we get coverage in the LOCAL case.

BUG=866502
TEST=test only changes

Change-Id: If6d1d0bd50c79b727fd9f38c3662312a76ca7d53
Reviewed-on: https://chromium-review.googlesource.com/1256011
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595634}