Replaced the trivial right shift macro at remaining 4 places and removed from signal_processing. Affected components: * vad * aecm BUG=3348,3353 TESTED=locally on linux and trybots R=kwiberg@webrtc.org Review URL: https://webrtc-codereview.appspot.com/25849004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7434 4adac7df-926f-26a2-2b94-8c16560cd09d