Make HttpNetworkTransaction no longer own a reference to HttpNetworkSession.

net/http/http_network_transaction.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_network_transaction.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 141 matching lines @@
     } else {
       if (stream_->IsResponseBodyComplete()) {
         // If the response body is complete, we can just reuse the socket.
         stream_->Close(false /* reusable */);
       } else if (stream_->IsSpdyHttpStream()) {
         // Doesn't really matter for SpdyHttpStream. Just close it.
         stream_->Close(true /* not reusable */);
       } else {
         // Otherwise, we try to drain the response body.
         HttpStreamBase* stream = stream_.release();
-        stream->Drain(session_.get());
+        stream->Drain(session_);
       }
     }
   }
 
   if (request_ && request_->upload_data_stream)
     request_->upload_data_stream->Reset();  // Invalidate pending callbacks.
 }
 
 int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
                                   const CompletionCallback& callback,
@@ skipping 1314 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net