3b3622fafc
Replaced with scalars ulpfec_payload_type and red_payload_type. In particular, ulpfec.red_rtx_payload_type, which duplicated info in rtx_associated_payload_types, is deleted. This is a followup to cl https://codereview.webrtc.org/3012963002. BUG=webrtc:7135 Review-Url: https://codereview.webrtc.org/3019453002 Cr-Commit-Position: refs/heads/master@{#19965}