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This is a reland of ddb531f7

There is a fix in media_session_service.cc to allow the tests to pass
when ash-chrome is not running.

Original change's description:
> [Media Session] Fix for Lacros
>
> At the moment in Lacros there are two instances of the
> Media Session Service (MSS) one hosted in ash-chrome and
> the other in lacros-chrome. This means that sessions in
> either browser process cannot see sessions from the other.
>
> This changes it so when a client asks for lacros-chrome
> MSS instead of providing a locally hosted MSS it binds
> the MSS in ash-chrome.
>
> BUG=1140215
>
> Change-Id: Ic155a6cd928f0735095f849f309f9075dbb1d36f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485850
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Erik Chen <erikchen@chromium.org>
> Commit-Queue: Becca Hughes <beccahughes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825016}

Bug: 1140215
Change-Id: I64834d9be778998b42bf3447444a6955265215ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2525851Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825439}