2c9c83d7ecd7251362d438abc70c9f50b208f316

A few other cleanups, most notably using a sane parameter to specify the number of channels. BUG=chromium:469814 R=tina.legrand@webrtc.org Review URL: https://webrtc-codereview.appspot.com/46729004 Cr-Commit-Position: refs/heads/master@{#8894}
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