This reverts commit d67903d284353dffcf28dfb92819e3d7c4b69bfd. Reason for revert: A downstream issue needs to be fixed. Original change's description: > Make MockPeerConnectionInterface not inherit from RefCountedObject > > Bug: webrtc:12701 > Change-Id: I51fb7caf12b97d70f35af12703104112f9fdfaff > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256107 > Auto-Submit: Tomas Gunnarsson <tommi@webrtc.org> > Reviewed-by: Harald Alvestrand <hta@webrtc.org> > Commit-Queue: Harald Alvestrand <hta@webrtc.org> > Cr-Commit-Position: refs/heads/main@{#36267} Bug: webrtc:12701 Change-Id: I25e2d6004d257dd0b1d17fb1f7726d04d29e6eed Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256109 Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36271}