Niels Möller ca79dc6779 Delete VideoReceiver2::TriggerDecoderShutdown.
This method used to be wired down to VCMReceiver and to
VCMJitterBuffer::Stop, but has become a nop. Also delete some
obsoleted comments.

Bug: webrtc:7408
Change-Id: I4c1e67272b1ffda786cc0ff358fa38e594aff304
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152620
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29167}
2019-09-12 13:44:13 +00:00
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