Polymorphic comparison operators doesn't work in C++20. (-Wambiguous-reversed-operator) Fix this issue by using the non-virtual interface pattern. Bug: chromium:1284275 Change-Id: I79e2bbcd3ae2f3b089183146f7e7c775c493e3f4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/276560 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#38210}