AEC: Moved delay buffer size enums from aec_core.h to aec_core_internal.h

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/webrtc@5995 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed