These metrics are no longer in use:
WebRTC.Audio.EchoCanceller.ActiveRender
WebRTC.Audio.EchoCanceller.ErleBand*
WebRTC.Audio.EchoCanceller.ErlBand*
Corresponding CL to mark obsolete in histograms.xml:
https://chromium-review.googlesource.com/c/chromium/src/+/2485059
Bug: chromium:1140067,chromium:1140071,chromium:1140073
Change-Id: Icb79b540f340a596c178f352363b30dc7b885251
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/189783
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32449}