The data-channel only target "peerconnectionfactory_no_media_objc"
transitively depends on libvpx via "peerconnectionfactory_base_objc".
This CL breaks the dependency between "objc_peeerconnectionfactory_base"
and libvpx moving RTCVideoCodecVP8.mm and RTCVideoCodecVP9.mm to
"peerconnectionfactory_objc" (together with RTCVideoCodecH264.mm).
Bug: webrtc:8594
Change-Id: Idfe3024163012925f017ad8c585b7ae21e86c319
Reviewed-on: https://webrtc-review.googlesource.com/27480
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20969}
8e28c56a30