Also use local aliases for AudioBuffers for brevity. BUG=2894 R=aluebs@webrtc.org, bjornv@webrtc.org Review URL: https://webrtc-codereview.appspot.com/13369005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5973 4adac7df-926f-26a2-2b94-8c16560cd09d