Simple rename to reflect that any AEC implementing the EchoControl interface could be used instead of EchoCanceller3. Bug: webrtc:8346 Change-Id: Id9abdc15bf3e0b30197077b8c11e20891a7463b3 Reviewed-on: https://webrtc-review.googlesource.com/7611 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20203}