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}