johan d89ab145cd Introduce rtc::PacketTransportInterface and let cricket::TransportChannel inherit.
Introduce rtc::PacketTransportInterface. Refactor cricket::TransportChannel.
Fix signal slots parameter types in all related code.

BUG=webrtc:6531

Review-Url: https://codereview.webrtc.org/2416023002
Cr-Commit-Position: refs/heads/master@{#14778}
2016-10-25 17:50:41 +00:00
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