Remove developing code in ns_core

This defines were hardcoded and the code inside of the ifdefs was never used.

BUG=webrtc:3763
R=bjornv@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/24559004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7153 4adac7df-926f-26a2-2b94-8c16560cd09d