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This implements slide 13 of the spec attached to the bug
on the site details page.

When we enable the new unified autoplay sound settings UI the
sound settings dropdown on the site details UI should have custom
wording based on the state of the sound content setting and
the unified autoplay enabled pref.

BUG=865548

Change-Id: Id52b7cb9d1fdf06236a0094621fea9c46569cf34
Reviewed-on: https://chromium-review.googlesource.com/1160873
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583521}