The echo detector is currently stored as a unique_ptr, but when injecting an echo detector, a scoped_refptr makes more sense since the ownership will be shared. Bug: webrtc:8732 Change-Id: I2180014acb84f1cd5c361864a444b7b6574520f5 Reviewed-on: https://webrtc-review.googlesource.com/83325 Commit-Queue: Ivo Creusen <ivoc@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23610}