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This is prep for always displaying a widget as key if one of its children is key.

No behavior change intended.

Bug: 1046540
Change-Id: I3b667e5f285ac1b8c681f25714647dec8242bf6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031427Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737330}