Peter Boström a6c39d9902 Remove unimplemented VideoChannel code.
Also removing a lot of dead testcases that were copied over and made
sense in the old implementation, now they just take space.

BUG=
R=pthatcher@google.com, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1658533003 .

Cr-Commit-Position: refs/heads/master@{#11450}
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