Tomas Gunnarsson b2995a1e57 Delete dead signal code in pc/channel.*
SignalDtlsSrtpSetupFailure is never fired, so the setup code for it,
is dead code. Also removing declarations for methods that have no
implementation.

For other public signals in BaseChannel I've added an accessor which
has revealed a threading problem due to the member variable being public.

Bug: webrtc:11994
Change-Id: Iec6046c6a598066b92c956002ba4160708ae7dcc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185802
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32211}
2020-09-28 14:24:41 +00:00
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