In preparation for also moving the responsibility for encoder creation.
Bug: webrtc:8830
Change-Id: Ic3d2039a86cd31c1b4157f5df4e97b607c81f1d7
Reviewed-on: https://webrtc-review.googlesource.com/55264
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22630}