Remove obosolete SessionId setter/getter from PortAllocator.

webrtc/p2p/base/transportchannel.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.
  */
 
@@ skipping 48 matching lines @@
         writable_(false),
         receiving_(false) {}
   virtual ~TransportChannel() {}
 
   // TODO(guoweis) - Make this pure virtual once all subclasses of
   // TransportChannel have this defined.
   virtual TransportChannelState GetState() const {
     return TransportChannelState::STATE_CONNECTING;
   }
 
-  // TODO(mallinath) - Remove this API, as it's no longer useful.
-  // Returns the session id of this channel.
-  virtual const std::string SessionId() const { return std::string(); }
-
   const std::string& transport_name() const { return transport_name_; }
   int component() const { return component_; }
 
   // Returns the states of this channel.  Each time one of these states changes,
   // a signal is raised.  These states are aggregated by the TransportManager.
   bool writable() const { return writable_; }
   bool receiving() const { return receiving_; }
   DtlsTransportState dtls_state() const { return dtls_state_; }
   sigslot::signal1<TransportChannel*> SignalWritableState;
   // Emitted when the TransportChannel's ability to send has changed.
@@ skipping 105 matching lines @@
   bool writable_;
   bool receiving_;
   DtlsTransportState dtls_state_ = DTLS_TRANSPORT_NEW;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(TransportChannel);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORTCHANNEL_H_