These enums are noly used internally in aec_core.c and it makes more sense to put them in aec_core_internal.h TESTED=trybots R=aluebs@webrtc.org, kwiberg@webrtc.org Review URL: https://webrtc-codereview.appspot.com/19379005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5995 4adac7df-926f-26a2-2b94-8c16560cd09d