Revert of Remove reference counting from HttpNetworkSession.

net/http/http_response_body_drainer_unittest.cc

 // 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.
 
 #include "net/http/http_response_body_drainer.h"
 
 #include <stdint.h>
 
 #include <cstring>
 
@@ skipping 213 matching lines @@
     params.ssl_config_service = ssl_config_service_.get();
     params.http_server_properties = http_server_properties_->GetWeakPtr();
     params.transport_security_state = transport_security_state_.get();
     return new HttpNetworkSession(params);
   }
 
   scoped_ptr<ProxyService> proxy_service_;
   scoped_refptr<SSLConfigService> ssl_config_service_;
   scoped_ptr<HttpServerPropertiesImpl> http_server_properties_;
   scoped_ptr<TransportSecurityState> transport_security_state_;
-  const scoped_ptr<HttpNetworkSession> session_;
+  const scoped_refptr<HttpNetworkSession> session_;
   CloseResultWaiter result_waiter_;
   MockHttpStream* const mock_stream_;  // Owned by |drainer_|.
   HttpResponseBodyDrainer* const drainer_;  // Deletes itself.
 };
 
 TEST_F(HttpResponseBodyDrainerTest, DrainBodySyncSingleOK) {
   mock_stream_->set_num_chunks(1);
   mock_stream_->set_sync();
   drainer_->Start(session_.get());
   EXPECT_FALSE(result_waiter_.WaitForResult());
@@ skipping 57 matching lines @@
   too_many_chunks += 1;  // Now it's too large.
 
   mock_stream_->set_num_chunks(too_many_chunks);
   drainer_->Start(session_.get());
   EXPECT_TRUE(result_waiter_.WaitForResult());
 }
 
 }  // namespace
 
 }  // namespace net