Steve Anton 0807d152d5 Remove more dead code from BaseChannel
This removes the following methods:
- SetAudioSend (directly accessed through MediaChannel now)
- "Early Media" (feature not used)
- GetStats (directly accessed through MediaChannel now)

Bug: None
Change-Id: Ifd075d030b0f5f41e94918979891592a731d5a91
Reviewed-on: https://webrtc-review.googlesource.com/59500
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22298}
2018-03-05 20:23:00 +00:00
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