stats() method on EmulatedEndpoint has to be called from network
emulation internal task queue and user has no access to that task queue,
so user can't call this method. Because of that remove it from public
API and keep it only on implementation.
Bug: webrtc:11756
Change-Id: I2fb7256abe94d6900965512f90c6a53a0708a7b0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180880
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31867}
9dcab80617