This refactoring makes it easier to experiment with injectable components. Bug: webrtc:8732 Change-Id: I2cd2a8ff80516a76aec814af02b61778915f2217 Reviewed-on: https://webrtc-review.googlesource.com/60863 Commit-Queue: Ivo Creusen <ivoc@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22372}