Revert of Remove GetTransport() from TransportChannelImpl

webrtc/p2p/base/transportchannelimpl.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_
 #define WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_
 
 #include <string>
+#include "webrtc/p2p/base/transport.h"
 #include "webrtc/p2p/base/transportchannel.h"
 
 namespace buzz { class XmlElement; }
 
 namespace cricket {
 
 class Candidate;
 
 // TODO(pthatcher): Remove this once it's no longer used in
 // remoting/protocol/libjingle_transport_factory.cc
 enum IceProtocolType {
   ICEPROTO_RFC5245  // Standard RFC 5245 version of ICE.
 };
 
 // Base class for real implementations of TransportChannel.  This includes some
 // methods called only by Transport, which do not need to be exposed to the
 // client.
 class TransportChannelImpl : public TransportChannel {
  public:
   explicit TransportChannelImpl(const std::string& transport_name,
                                 int component)
       : TransportChannel(transport_name, component) {}
 
+  // Returns the transport that created this channel.
+  virtual Transport* GetTransport() = 0;
+
   // For ICE channels.
   virtual IceRole GetIceRole() const = 0;
   virtual void SetIceRole(IceRole role) = 0;
   virtual void SetIceTiebreaker(uint64_t tiebreaker) = 0;
   // TODO(pthatcher): Remove this once it's no longer called in
   // remoting/protocol/libjingle_transport_factory.cc
   virtual void SetIceProtocolType(IceProtocolType type) {}
   // SetIceCredentials only need to be implemented by the ICE
   // transport channels. Non-ICE transport channels can just ignore.
   // The ufrag and pwd should be set before the Connect() is called.
@@ skipping 51 matching lines @@
   // channel decreases.
   sigslot::signal1<TransportChannelImpl*> SignalConnectionRemoved;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(TransportChannelImpl);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_