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I discovered this class while looking at keyboard::KeyboardUI.
It has the comment:

// KeyboardUI wraps the appropriate keyboard ui depending upon whether
// ash is running in mus or non-mus.

KeyboardUIMash is unused, and there is no longer mus/mash
differentiation, so the class seems unnecessary.

It is also super confusing since there is also keyboard::KeyboardUI
which is effectively unrelated. It's functionality can easily be
directly integrated with the callers.

Bug: 843332
Change-Id: Ib082a0f6f9bede2cef766c006e003dbe512be561
Reviewed-on: https://chromium-review.googlesource.com/1180255
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584507}