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The test was intended for a time when we would fully support tablet mode
with multiple displays and no display mirroring. It seems that just will
not happen in the foreseeable future.

Fixed: 1125848
Change-Id: I13ee5c2a0dd3f717489e615caa083fb74b6b859c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398974Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805038}