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We removed ash::Config::MUS as part of the switch to //services/ui/ws2.
ShellPortMus isn't used independently anymore.

Bug: 841941
Test: ash_unittests --enable-features=Mash
Change-Id: I506a0526aebd8b90f07d654ceaad8f90891106cb
Reviewed-on: https://chromium-review.googlesource.com/1072454
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562016}