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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/+/2485850Reviewed-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}