These methods no longer work with Unified Plan and have been
replaced by iterating over RtpTransceivers to get all the
VoiceChannels and VideoChannels.
Bug: webrtc:8587
Change-Id: I66ec282ee9f7eb987c32e30957733c13c6cf45b8
Reviewed-on: https://webrtc-review.googlesource.com/55760
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22110}