This moves the ownership away from VideoReceiveStream2 and closer to VCMDecoderDataBase. That facilitates unregistration (upcoming change) without recreating receive streams. Bug: none Change-Id: I812175134730a0ffbf7077fd149c8489481c73d8 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272481 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37866}