Revert of Remove GetTransport() from TransportChannelImpl

webrtc/p2p/base/p2ptransport.cc

 /*
  *  Copyright 2004 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 10 matching lines @@
 namespace cricket {
 
 P2PTransport::P2PTransport(const std::string& name, PortAllocator* allocator)
     : Transport(name, allocator) {}
 
 P2PTransport::~P2PTransport() {
   DestroyAllChannels();
 }
 
 TransportChannelImpl* P2PTransport::CreateTransportChannel(int component) {
-  return new P2PTransportChannel(name(), component, port_allocator());
+  return new P2PTransportChannel(name(), component, this, port_allocator());
 }
 
 void P2PTransport::DestroyTransportChannel(TransportChannelImpl* channel) {
   delete channel;
 }
 
 }  // namespace cricket