mikescarlett ee18220ddd 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=

Review URL: https://codereview.webrtc.org/1691673002

Cr-Commit-Position: refs/heads/master@{#11662}
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