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This will allow blocking when the media notifications are turned off but the new CrOS media
controls are enabled.

BUG=1142628

Change-Id: Ic35586c508c7c173c2ed828ff6697c841f9a6c84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625690
Auto-Submit: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842726}