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It's a mojo mini-app.  It's only used with mash, which only runs on
Chrome OS. Move it to the Chrome OS UI directory.

NOPRESUBMIT=true

Bug: none
Test: bots
Change-Id: I8da161c8ec4c95ab284d4b0e5248b6fff5a04406
Reviewed-on: https://chromium-review.googlesource.com/917208
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536758}