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This will remove the need for the child_infos_ field in LayoutManagerBase.

Somewhat related to the work of integrating fill layout behavior into views::View.

Bug: 1159116
Change-Id: I968aa58fb3b29f78d96cd520e61ccb731c2e9ac9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605567
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839620}