Reason for revert: This CL is breaking a lot of FYI bots. The specific change that breaks bots is the removal of a constructor parameter. See, for example: https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/3572/steps/compile/logs/stdio Original issue's description: > Remove GetTransport() from TransportChannelImpl > > 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} TBR=pthatcher@webrtc.org,mikescarlett@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG= Review URL: https://codereview.webrtc.org/1709953002 Cr-Commit-Position: refs/heads/master@{#11665}