GitLab

Move the media session and audio focus related switches to
the media session service.

BUG=875004

Change-Id: I54dad1eb47ac6288895ea3cac3824b181080f3e3
Reviewed-on: https://chromium-review.googlesource.com/1188747Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587676}