This CL reverts the changes introduced that handles echoes in AEC3. The revert is done to match the behavior which is in M63. Bug: webrtc:8615,chromium:792346 Change-Id: I128ccb17dc359c7889a701a2faaaf06be40f86dd Reviewed-on: https://webrtc-review.googlesource.com/30140 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21117}