Remove RTP Keep-alive from VoE and ViE. The RTP module functionality will be removed in a follow-up CL shortly.

TEST=VoE autotest and ViE autotest

Review URL: https://webrtc-codereview.appspot.com/458002

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1929 4adac7df-926f-26a2-2b94-8c16560cd09d
13 files changed