Let receiving() and SignalReceivingState be part of rtc::PacketTransportInterface.

webrtc/p2p/base/dtlstransportchannel.cc

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 453 matching lines @@
     case DTLS_TRANSPORT_CONNECTING:
       // Do nothing.
       break;
     case DTLS_TRANSPORT_FAILED:
     case DTLS_TRANSPORT_CLOSED:
       // Should not happen. Do nothing.
       break;
   }
 }
 
-void DtlsTransportChannelWrapper::OnReceivingState(TransportChannel* channel) {
+void DtlsTransportChannelWrapper::OnReceivingState(
+    rtc::PacketTransportInterface* transport) {
   ASSERT(rtc::Thread::Current() == network_thread_);
-  RTC_DCHECK(channel == channel_);
+  RTC_DCHECK(transport == channel_);
   LOG_J(LS_VERBOSE, this)
       << "DTLSTransportChannelWrapper: channel receiving state changed to "
       << channel_->receiving();
   if (!dtls_active_ || dtls_state() == DTLS_TRANSPORT_CONNECTED) {
     // Note: SignalReceivingState fired by set_receiving.
     set_receiving(channel_->receiving());
   }
 }
 
 void DtlsTransportChannelWrapper::OnReadPacket(
@@ skipping 242 matching lines @@
   ASSERT(channel == channel_);
   SignalStateChanged(this);
 }
 
 void DtlsTransportChannelWrapper::OnDtlsHandshakeError(
     rtc::SSLHandshakeError error) {
   SignalDtlsHandshakeError(error);
 }
 
 }  // namespace cricket