zstein 398c3fd6c2 Introduce RtpTransportInternal and SrtpTransport.
SrtpTransport currently just delegates everything to RtpTransport.
Also makes BaseChannel::rtp_transport_ an RtpTransportInternal and constructs an SrtpTransport if srtp is required.

BUG=webrtc:7013

Review-Url: https://codereview.webrtc.org/2981013002
Cr-Commit-Position: refs/heads/master@{#19095}
2017-07-19 20:38:02 +00:00
..
2016-04-26 12:28:18 +00:00