Revert "Pull the Voice Activity Detector out from the AGC" This reverts commit 518c683f3e413523a458a94b533274bd7f29992d. Breaks Linux-Asan bot https://uberchromegw.corp.google.com/i/client.webrtc/builders/Linux%20Asan/builds/4348/steps/libjingle_peerconnection_unittest/logs/stdio BUG= TBR=aluebs@webrtc.org Review URL: https://codereview.webrtc.org/1208793002. Cr-Commit-Position: refs/heads/master@{#9503}