Tommi bb57e2d7aa Remove stopped_ from AudioRtpReceiver and VideoRtpReceiver.
This simplifies the logic in these classes a bit, which makes upcoming
change easier. The `stopped_` flag in these classes was essentially
the same thing as `media_channel_ == nullptr`, which is what's
consistently used now for the same checks.

Bug: webrtc:13540
Change-Id: Ib60bfad9f28d5ddee8a8d5170c3f2a7ef017a5ca
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/250163
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35907}
2022-02-04 14:00:42 +00:00
..
2019-01-28 11:17:00 +00:00
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