The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2ea32a019d497090bbf536ecbbc7cff779a2ccdf

commit 2ea32a019d497090bbf536ecbbc7cff779a2ccdf
Author: warx <warx@chromium.org>
Date: Fri Jun 24 05:50:11 2016

clean oobe mono audio setting as they are not used

BUG= 622959 
TEST=none

Review-Url: https://codereview.chromium.org/2096983002
Cr-Commit-Position: refs/heads/master@{#401823}

[modify] https://crrev.com/2ea32a019d497090bbf536ecbbc7cff779a2ccdf/chrome/app/chromeos_strings.grdp
[modify] https://crrev.com/2ea32a019d497090bbf536ecbbc7cff779a2ccdf/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
[modify] https://crrev.com/2ea32a019d497090bbf536ecbbc7cff779a2ccdf/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h

@warx This bug has no UI related changes that our team could verify. Could you please verify this one from your end?

Yes, it doesn't change UI and it shouldn't.

Thanks @warx.
Closing the bug