johan a9c7cfac41 Prepare for introduction of rtc::PacketTransportInterface.
A rtc::PacketTransportInterface typedef is introduced to allow preparing
downstream projects for the upcoming refactoring of
cricket::Transport. This refactoring will introduce
rtc::PacketTransportInterface in https://codereview.webrtc.org/2416023002/ .

BUG=webrtc:6531

Review-Url: https://codereview.webrtc.org/2429803002
Cr-Commit-Position: refs/heads/master@{#14672}
2016-10-18 22:38:43 +00:00
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