minyuel 0f4b3731c3 Stylizing AudioConferenceMixer.
Cleaning AudioConferenceMixer APIs to match Chromium style guide.

Main changes:
1. change all mutable references to pointers
2. add const to all non-mutable references
3. add const to as many methods as possible

BUG=
R=andrew@webrtc.org

Review URL: https://codereview.webrtc.org/1311733003 .

Cr-Commit-Position: refs/heads/master@{#9821}
2015-08-31 14:04:44 +00:00
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