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Applies the fuchsia.web.AutoplayPolicy which may be passed in at Frame
creation time to the Frame's top-level WebContents.

Test: autoplay_browsertest.cc
Bug: 1067101
Change-Id: Id3b69ddea474c9b8d6f2a1b05ec195270cad3cf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533555
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827132}