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Since r798292 NativeWidgetMacTest.WindowModalSheet has checked for
the presence of a special child window that macOS 11 splices into the
window tree to do the "blur" sheet visual effect. During one of the
later betas it appears that the system stopped adding this child
window, which broke this test.

Bug: 1169225
Change-Id: I8a31e8c6b9ab31c54c9f1a7f819510c1175ea23c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643517Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845810}