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The autoplay policy should follow the kBlockAutoplayEnabled pref
if the kAutoplaySoundSettings feature is enabled. If the pref is
true we will use document-user-activation otherwise we will
use no-user-gesture-required.

The only exception is if the user has overridden the autoplay
policy in which case we will use the autoplay policy command
line switch.

BUG=865548

Change-Id: I79ba3bbf5542ba17af9ab96baef80cd89d5b5326
Reviewed-on: https://chromium-review.googlesource.com/1157199
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581382}