Instead require Create to be implemented Bug: webrtc:15791 Change-Id: I17477b5f047d86b6a05bda594c66d20f8f43a2c6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340480 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41857}