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Ensure that code associated with the UI Service, which is used on both
chromeos and linux-ozone, uses files and functions named *mus*.

Reserve *mash* for chromeos-only code that runs under --mash and uses
the ash window manager.

Bug: 722527
Test: chrome, chrome --mus, and chrome --mash run with target_os="chromeos" and linux-ozone still compiles (I can't run linux-ozone due to xkb issues)
Change-Id: I452e80dffb16d6445f40757d1198ff98233bb528
Reviewed-on: https://chromium-review.googlesource.com/822455
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524010}