These methods previously had a default implementation that triggered
a crash. All implementations must now return a valid object, which
simplifies the code that calls them.
Bug: webrtc:13931
Change-Id: I877fbc929b58c6b83767c6ac5a81c8aa942e3fef
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/369021
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43453}
98b3588974