johan 15ca8f6aeb Let receiving() and SignalRecevingState be part of rtc::PacketTransportInterface.
Writable() and the related signal are already part of rtc::PacketTransportInterface. Sense of code symmetry aesthetics dictates that receiving() and the related signal should be declared in the same place.

BUG=webrtc:6531

Review-Url: https://codereview.webrtc.org/2444793003
Cr-Commit-Position: refs/heads/master@{#14865}
2016-11-01 08:47:48 +00:00
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