The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/33775ed4e7e17e819d8b59eca51bca6d74e5cec0

commit 33775ed4e7e17e819d8b59eca51bca6d74e5cec0
Author: Guido Urdaneta <guidou@chromium.org>
Date: Wed May 16 11:44:49 2018

Move audio device monitoring on Mac to audio service.

Bug:  843149 
Change-Id: Ic7504928e13de7e19e286f351997d28b19e0e18f
Reviewed-on: https://chromium-review.googlesource.com/1059625
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559042}
[modify] https://crrev.com/33775ed4e7e17e819d8b59eca51bca6d74e5cec0/content/browser/renderer_host/media/media_devices_manager.cc
[modify] https://crrev.com/33775ed4e7e17e819d8b59eca51bca6d74e5cec0/media/device_monitors/device_monitor_mac.h
[modify] https://crrev.com/33775ed4e7e17e819d8b59eca51bca6d74e5cec0/media/device_monitors/device_monitor_mac.mm
[modify] https://crrev.com/33775ed4e7e17e819d8b59eca51bca6d74e5cec0/services/audio/service.cc
[modify] https://crrev.com/33775ed4e7e17e819d8b59eca51bca6d74e5cec0/services/audio/service.h