To unblock code cleanup, uses of Members() are replaced by
Attributes(). This will allow replacing RTCStatsMember<T> with
absl::optional<T> in a future CL.
Bug: webrtc:15164
Change-Id: I4ed32ef8ea3d8fd7506415848e044e34377fce8f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/334161
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41511}