This is the naming scheme we've been using for internal interfaces. Also, this CL will introduce a PacketTransportInterface in the webrtc namespace, which would get too easily confused with the rtc:: one: https://codereview.webrtc.org/2675173003/ BUG=None Review-Url: https://codereview.webrtc.org/2679103006 Cr-Commit-Position: refs/heads/master@{#16539}