This appears to be dead code because GetTransport() is not used by WebRTC. It also adds dead code to DtlsTransportChannelWrapper and P2PTransportChannel. BUG= Committed: https://crrev.com/ee18220ddd783fad9812f1c1c195bf187a631c3a Cr-Commit-Position: refs/heads/master@{#11662} Review URL: https://codereview.webrtc.org/1691673002 Cr-Commit-Position: refs/heads/master@{#11695}