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This unit test is redundant with
VirtualKeyboardRootWindowControllerTest_FollowInputFocus which uses a
test DisplayManager utility to properly mock the displays.

The problem with the ui/keyboard unit test is that it simply mocks
windows and treats them as root windows. I'll be following this CL up
with more changes that use displays instead of just root windows and
if this isn't removed, it will start failing.

Change-Id: I20b5c8dfb947211161b7cd761390bc8a76229370
Reviewed-on: https://chromium-review.googlesource.com/991893Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Blake O'Hare <blakeo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547914}