Remove ViE external encryption API.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8079005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5525 4adac7df-926f-26a2-2b94-8c16560cd09d
31 files changed