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This implements a variety of nits from the review, brings the
implementations of the shortage and excess passes closer together, and
removes the flex_layout-specific OWNERS since this is now owned by the
main Views team in the same way as the rest of the directory.

Bug: none
Change-Id: I0d37f261e4d8ad7211919bc9df7bbc5b09e4489a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427532
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810403}