* Remove unnecessary decoder factory pointer. * Set video decoder factory in the ctor of the config class. * Prepare SetRecvParameters for not needing RecreateWebRtcVideoStream. Bug: none Change-Id: I48fbf2920c9fe50f3995ceab5667eb2f70618f25 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/223067 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Tommi <tommi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34351}