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This reverts commit 657b47a9.

Reason for revert: breaks regular media session notifications on WebLayer

Original change's description:
> WebLayer: hook up volume control for Media Router
>
> Using the phone's volume button when casting should change the casting
> volume.
>
> Bug: 1057099
> Change-Id: I50971df97df598922c6da683cbfd376d2e42859f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515282
> Commit-Queue: Evan Stade <estade@chromium.org>
> Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825152}

TBR=estade@chromium.org,mlamouri@chromium.org,tguilbert@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1057099
Change-Id: I1d560a9ec4bebd02c7c47b59c760fbb05904c63f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533806Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826609}