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This reverts commit da320a9f.

Reason for revert: Unfortunately this seems to be causing a CI failure: 
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8898137098615237856/+/steps/aura_unittests/0/logs/Deterministic_failure:_WindowTreeHostTest.DPIWindowSize__status_FAILURE_/0

Original change's description:
> X11Window: Avoid size hack for tests
> 
> The default configuration of TestScreen is to create one display and one
> WindowTreeHost with the same size.
> 
> X11 is now incompatible with this requirement as of b14e13fd ("Reland
> "X11 and Ozone: DWTHPlatform handles Show/Hide/Max/Restore/Full"").
> 
> Several aura tests are only passing currently due to another bug in
> DisplayList::UpdateDisplay, which prevents X11Window from
> seeing the current display size and enforcing the constraint.
> 
> Other tests only work because TestScreen resizes the display to match
> the WindowTreeHost /after/ X11Window deletes the last row and column.
> i.e., X11Window tries to adjust the size to not match the display,
> and then TestScreen re-adjusts the display to match the window. This
> behavior is not convergent and causes small changes in initialization
> order to affect the dimensions of test windows.
> 
> This hack should likely be removed altogether and the bug it's addressing
> fixed another way, but for now disable it in the test harness because it
> is blocking other changes such as a fix for the UpdateDisplay bug noted
> above.
> 
> Bug: 1019015
> 
> Change-Id: I79e830b9c35df3df29dc8af50ac424076682d180
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889294
> Commit-Queue: Michael Spang <spang@chromium.org>
> Reviewed-by: Michael Spang <spang@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#710955}

TBR=sky@chromium.org,spang@chromium.org,thomasanderson@chromium.org,msisov@igalia.com

Change-Id: I1177d258e4957dc1f216e18c6df95067f7cbb0ed
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1019015
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890458Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711094}