Adding pbos as video/ owner and removing persons never working with this folder.
Adding pbos as video/ owner and removing persons never working with this folder.

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15979004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 614000d6387f60db0069ae10ebb8d5cf8ac005de

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc