Same method, different name. Unblocks replacing RTCStatsMember<T> with absl::optional<T>. Bug: webrtc:15164 Change-Id: I251dd44d3b0f9576b3b68915fe0406d1b3381e5c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/334641 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41573}