Make HttpNetworkTransaction no longer own a reference to HttpNetworkSession.

net/http/http_network_transaction.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 238 matching lines @@
       auth_controllers_[HttpAuth::AUTH_NUM_TARGETS];
 
   // Whether this transaction is waiting for proxy auth, server auth, or is
   // not waiting for any auth at all. |pending_auth_target_| is read and
   // cleared by RestartWithAuth().
   HttpAuth::Target pending_auth_target_;
 
   CompletionCallback io_callback_;
   CompletionCallback callback_;
 
-  scoped_refptr<HttpNetworkSession> session_;
+  HttpNetworkSession* session_;
 
   BoundNetLog net_log_;
   const HttpRequestInfo* request_;
   RequestPriority priority_;
   HttpResponseInfo response_;
 
   // |proxy_info_| is the ProxyInfo used by the HttpStreamRequest.
   ProxyInfo proxy_info_;
 
   scoped_ptr<HttpStreamRequest> stream_request_;
@@ skipping 35 matching lines @@
   // True when the tunnel is in the process of being established - we can't
   // read from the socket until the tunnel is done.
   bool establishing_tunnel_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_