[webrtc-pc] Make the set of transports for a PC obvious (#2563)

alvestrand has just created a new issue for https://github.com/w3c/webrtc-pc:

== Make the set of transports for a PC obvious ==
It seems kind of obvious that the set of transports that are considered for IceGatheringState computation is the set of transports referenced by visible transceivers + the transport referenced by the SctpTransport (if non-null).
Thus, a transport attached only to a transceiver will disappear from the set when the transceiver transits to "stopped" after a negotiation, but it doesn't go away simply because "stop" is called.

However, I don't think that's said explicitly anywhere.
Should it be?


Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/2563 using your GitHub account


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