Remove code where integer -1 as delay is used to represent unset value. Bug: webrtc:13756 Change-Id: I16a01e12c25a09ce21a971c9edabf47af5936662 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/316923 Auto-Submit: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40592}