GitLab

Switch the content MediaSession code to using the audio
focus service on non-Android platforms.

BUG=875004

Change-Id: I8171a7351a7d64065564fe5f75937e1abaef8e7c
Reviewed-on: https://chromium-review.googlesource.com/c/1207657Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596456}