Instead of int and magic value -1. Bug: webrtc:14884 Change-Id: Ieec148a66956aa763c7c5cd2c9519e36a4bea01b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/293346 Commit-Queue: Henrik Boström <hbos@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Evan Shrubsole <eshr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39324}