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Remove the AutoplayMutedVideos feature which is set based on
the autoplay policy command line switch. This means it
ignores if we have overridden the autoplay policy for the
document.

Instead we should perform this check in AutoplayPolicy
which will have the final autoplay policy for the
document.

BUG=865548

Change-Id: Iddfb9d0b3fef3bfa6efc493876094eaf2f8f7799
Reviewed-on: https://chromium-review.googlesource.com/1157215Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580649}