Wrap ACM2 code inside acm2 namespace. This gurantees that one ACM would not use components of others by accident.

BUG=
R=minyue@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2344004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4933 4adac7df-926f-26a2-2b94-8c16560cd09d
61 files changed