Niels Möller 1a09faed62 Delete SignalDataChannelTransportNegotiated
This negotiation no longer takes place.

Bug: webrtc:9719
Change-Id: I33bd985105076fabf3200c31ea06b84b413794e6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/179363
Reviewed-by: Taylor <deadbeef@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31753}
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