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To create the dimming visual effect when showing a sheet in Big Sur,
AppKit installs a new child window of the window with the sheet,
which breaks NativeWidgetMacTest.WindowModalSheet.

Bug: 1114245
Change-Id: Ib7185441e1c52e0990caa1c92f5f773431d66775
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357633
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798292}