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LoginCursorTest.CursorHidden and OobeTest.Accelerator are still
crashing even after the refactoring of UIControls and aura::Env.
Actually, these tests do not require browser windows therefore
UIControlsOzone is created with nullptr WindowTreeHost which is
not expected.

Thinking about that, such test cases actually do controls for
the UI within Ash -- therefore AshUIControls should be used.

Test: interactive_ui_tests with --enable-features=SingleProcessMash
Bug: 883523
Change-Id: I3d6e1ecb569551a7eacfce979c4b543771f19fc6
Reviewed-on: https://chromium-review.googlesource.com/1236842Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592953}