Revert r47395. Looks like it still crashes =/

net/http/http_cache.cc

 // Copyright (c) 2010 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_cache.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 
@@ skipping 393 matching lines @@
 }
 
 void HttpCache::CloseCurrentConnections() {
   net::HttpNetworkLayer* network =
       static_cast<net::HttpNetworkLayer*>(network_layer_.get());
   HttpNetworkSession* session = network->GetSession();
   if (session) {
     session->tcp_socket_pool()->CloseIdleSockets();
     if (session->spdy_session_pool())
       session->spdy_session_pool()->CloseAllSessions();
-    session->Flush();
+    session->ReplaceTCPSocketPool();
   }
 }
 
 //-----------------------------------------------------------------------------
 
 int HttpCache::CreateBackend(disk_cache::Backend** backend,
                              CompletionCallback* callback) {
   if (!backend_factory_.get())
     return ERR_FAILED;
 
@@ skipping 611 matching lines @@
     // This could be an external caller or a transaction waiting on Start().
     pending_item->DoCallback(result, temp_backend_);
     pending_item->NotifyTransaction(result, NULL);
   }
 
   DeletePendingOp(pending_op);
   building_backend_ = false;
 }
 
 }  // namespace net