removed NetEq::EnableDtmf()

BUG=webrtc:1373
R=turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1822005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4492 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed