Remove unnecessary include_dirs from audio_processing.

TBR=aluebs
TESTED=trybots

Review URL: https://webrtc-codereview.appspot.com/3659004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5106 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed