Mainly remove CHECKinitialized_ macro and AGC functionality. Also make actual behavior clearer in some functions. Bug: webrtc:7452 Change-Id: I1eac86f4eaff7b14820d3e4192b15c20ab6acb45 Reviewed-on: https://webrtc-review.googlesource.com/69161 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Paulina Hensman <phensman@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22820}