22c2729607964aa38d6cb4e521994453b6a271c4

Unit tests around AudioConferenceMixer was severely missing. This CL is to add some tests. BUG= R=ajm@chromium.org, andrew@webrtc.org Review URL: https://codereview.webrtc.org/1257583011 . Cr-Commit-Position: refs/heads/master@{#9825}
Revert of Fix PRESUBMIT.py after disabling CQ. (patchset #1 id:1 of https://codereview.webrtc.org/1192673003/)
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