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Avoid an arbitrary default display size of 800x600 on headless. Headless
is used on some products that don't have an attached display and having
a large dummy display can cause unnecessary work.

This doesn't stop tests from creating 800x600 windows; it's fine to
create a window larger than the display.

Bug: 1017311, 891613

Change-Id: If0ef5b7f41df5a987c4ce1d819432661e00e2a52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872949
Commit-Queue: Michael Spang <spang@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Auto-Submit: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709215}