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This code is basically lifted from LayoutFlexibleBox::RemoveChild.

Bug: 845235
Change-Id: Icdda90143d896cb9678cab3cde1bfc4554471701
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982619Reviewed-by: David Grogan <dgrogan@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728109}