Harald Alvestrand c06e374a55 Move more functions from PeerConnection to SdpOfferAnswer
These are functions that are called only from SdpOfferAnswer,
or that logically belong in the SdpOfferAnswer class.

Bug: webrtc:11995
Change-Id: I92136ee84e20e50957814c21b041ca152a2acca4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186268
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32271}
2020-10-01 12:25:59 +00:00
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