New OwnedPeerConnection takes ownership of the observer. This is done to allow NativePeerConnectionFactory to return a capsulated object. Bug: webrtc:8662 Change-Id: Ie876f7b9a1a17ebcfbe51537f712a32ab1a7cbfb Reviewed-on: https://webrtc-review.googlesource.com/35300 Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21610}