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The policy for test code in //ash is that it should live in the
directory of the code under test, which in this case is //ash/wm.

This fixes a TODO in //ash/BUILD.gn

Bug: none
Test: ash_unittests
Change-Id: Id40eaa137991efbb47b83c322eb6cf9c7bb405ec
Reviewed-on: https://chromium-review.googlesource.com/892198
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532958}