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This CL makes sure Picture-in-Picture window size never gets bigger than
allowed.

Change-Id: Id008900ef18b85efa5823747f6529dd0d5abc57d
Reviewed-on: https://chromium-review.googlesource.com/c/1363279Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#615828}