Created probes are currently timed out after 5s. But to be safe, also limit the number of pending probes to 5. Bug: webrtc:14392, b/259541308 Change-Id: Ibf630704ffe14cb165ab849b881cf75857376f82 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/284080 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38697}