Made the AEC3 alignment a mandatory for using the adaptive filter delay

This CL ensures that the adaptive filter delay is not used for fine
tune echo removal unless the render and capture signals have been
properly aligned.

BUG=webrtc:8189

Review-Url: https://codereview.webrtc.org/3003303002
Cr-Original-Commit-Position: refs/heads/master@{#19492}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: b1737fc198ca768abdb6c0753e4f4cda5766aff6
1 file changed