This delete field trial WebRTC-Video-BufferPacketsWithUnknownSsrc. Bug: webrtc:10405 Change-Id: I478c015b359dece6041f2a768d5aa1055235ee6f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288600 Auto-Submit: Per Kjellander <perkj@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38926}