Remove obosolete SessionId setter/getter from PortAllocator.

webrtc/p2p/base/portallocator.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 50 matching lines @@
     PortAllocatorSession* pooled_session = CreateSessionInternal("", 0, "", "");
     pooled_session->StartGettingPorts();
     pooled_sessions_.push_back(
         std::unique_ptr<PortAllocatorSession>(pooled_session));
     ++allocated_pooled_session_count_;
   }
   target_pooled_session_count_ = candidate_pool_size;
 }
 
 std::unique_ptr<PortAllocatorSession> PortAllocator::CreateSession(
-    const std::string& sid,
     const std::string& content_name,
     int component,
     const std::string& ice_ufrag,
     const std::string& ice_pwd) {
   auto session = std::unique_ptr<PortAllocatorSession>(
       CreateSessionInternal(content_name, component, ice_ufrag, ice_pwd));
   session->SetCandidateFilter(candidate_filter());
   return session;
 }
 
@@ skipping 18 matching lines @@
 }
 
 const PortAllocatorSession* PortAllocator::GetPooledSession() const {
   if (pooled_sessions_.empty()) {
     return nullptr;
   }
   return pooled_sessions_.front().get();
 }
 
 }  // namespace cricket