Peter Boström f2bfc2b8ef Remove some dead code.
WebRtcPassthroughRender has been dead since webrtcvideoengine.cc was
removed, FakeExternalTransport has probably been unused for a long time.

BUG=webrtc:1695
R=henrika@webrtc.org

Review URL: https://codereview.webrtc.org/1343393003 .

Cr-Commit-Position: refs/heads/master@{#9968}
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