Minor cleanup to remove unused typedef. Bug: chromium:1291247 Change-Id: Idbbe8dba13d4d14888f843ae170a898ff604852b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249700 Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Salman Malik <salmanmalik@google.com> Cr-Commit-Position: refs/heads/main@{#35968}