VAD refactoring: Local variable name changes
VAD refactoring: Local variable name changes

Changes tested with vad_unittests and audioproc_unittest

BUG=None
TEST=None

Review URL: https://webrtc-codereview.appspot.com/485004

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@2093 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override