Also making member objects directly owned rather than
using unique_ptr as that's no longer needed.
Bug: webrtc:9870
Change-Id: I4bc85150d3b72b93fee05c85f79f20290cd5124d
Reviewed-on: https://webrtc-review.googlesource.com/c/105480
Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25180}