This drops the locks and annotations in EchoControlMobileImpl,
now that the interface is no longer externally accessible.
Additionally, SetEchoPath and GetEchoPath (with surrounding code) is
removed. They are unused.
Bug: webrtc:9929
Change-Id: Ibc6751754614ed39836f6ee6835d7b53dedd828c
Reviewed-on: https://webrtc-review.googlesource.com/c/109025
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25504}