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This is affecting WebView that has a different autoplay policy but
also would affect any client using a different policy from the default
one.

Bug: 850445
Change-Id: Ifaac3e15c4644c32e540b20e62bb3ee70d9a0b12
Reviewed-on: https://chromium-review.googlesource.com/1102827Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567753}