The new iceTransportState depends on the transports to signal when they have disconnected, this change ensures that they do so.
The logic is similar to what the old iceConnectionState did, but it uses the ice transports writable() flag instead of the one from the containing dtls transport.
Bug: webrtc:10199, webrtc:9308
Change-Id: I8a2a71a689b2a7027fe9117c79144811367d2165
Reviewed-on: https://webrtc-review.googlesource.com/c/117565
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26269}