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Child bubbles have padding and child spacing such that there are gaps
between holding space sections and child bubble edges as well as gaps
between holding space sections within the same child bubble.

Moving selection clearing to child bubbles instead of section views
eliminates what the user might otherwise perceive as dead spots.

Bug: 1167248
Change-Id: I561f2862258189fa9960d6c25de7bd6da124771a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632808Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#844186}