GitLab

The audio-service version was already marked flaky on Mac, but it's
flaky on other platforms too. The non-virtual version is also flaky
everywhere.

TBR=mlamouri@google.com

Bug: 1000051
Change-Id: I85f90e83e12169d5cd15b033e13b8d06b8149fb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816549Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698476}