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While working on crrev.com/c/1771937 to split by profile, it was clear
that MediaToolbarButtonController was going to have to be refactored to
be an AudioFocusObserver and would essentially have to do the same
tracking that MediaDialogController currently does. Instead of having
this tracking in two places, I've instead refactored the two
controllers into one.

Bug: 992463
Change-Id: Ie424044e8ee678effe869a131347ba7869157624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772421Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690769}