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which is a more modern way to represent something that either has a value or is not set BUG=webrtc:14544 Change-Id: I0a06b30b1c7f802247eb1f60e69271594b94a6f0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/278421 Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38443}