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By default, mus will not host viz when chrome is run with --mus. Instead,
it will expect chrome to host viz.

mus will continue to always host viz when chrome is run with --mash.

Bug: 786453
Change-Id: Ifea1a6a953d3e4d20b9d624e156c627a0122a344
Reviewed-on: https://chromium-review.googlesource.com/798776
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521357}