Steve Anton ed10bd9549 Modify SetLocalDescription helpers to work with RtpTransceivers
This change allows EnableBundle and PushdownMediaDescription to
work with RtpTransceivers, which means they can be reused in the
Unified Plan version of SetLocalDescription.

Bug: webrtc:8587
Change-Id: I4d862556879c14cea06fdf9d5c7c29cc32e1057a
Reviewed-on: https://webrtc-review.googlesource.com/27762
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Zhi Huang <zhihuang@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21092}
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