Triage nag: This Chrome OS bug has an owner but no component. Please add a component so that this can be tracked by the relevant team.

It's not entirely clear to me why the MockAudioManager was added, but it appears to be unnecessary and it is causing a crash in ioskVirtualKeyboardTest.RestrictFeatures with --enable-features=SingleProcessMash.

The test appears to succeed without MockAudioManager with or without SingleProcessMash.

https://chromium-review.googlesource.com/c/chromium/src/+/1381147

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/53295a7beb27a44387c51cc4763c6871ced2b937

commit 53295a7beb27a44387c51cc4763c6871ced2b937
Author: Steven Bennetts <stevenjb@chromium.org>
Date: Wed Dec 19 22:23:15 2018

Remove MockAudioManager from KioskVirtualKeyboardTest

It's not entirely clear why this was added, but it is breaking
SingleProcessMash and does not appear to be necessary for the test.

Bug:  812170 
Change-Id: I35a23d7304000d8c2c56d52da9ac1b8445a32cba
Reviewed-on: https://chromium-review.googlesource.com/c/1381147
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617980}
[modify] https://crrev.com/53295a7beb27a44387c51cc4763c6871ced2b937/chrome/browser/chromeos/login/kiosk_browsertest.cc