Implement a 15 connection per proxy server limit.

net/http/http_network_transaction.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 344 matching lines @@
 
   // The time the Start method was called.
   base::Time start_time_;
 
   // The time the DoSSLConnect() method was called (if it got called).
   base::TimeTicks ssl_connect_start_time_;
 
   // The next state in the state machine.
   State next_state_;
 
-  // The hostname and port of the peer.  This is not necessarily the one
-  // specified by the URL, due to Alternate-Protocol or proxies.
-  HostPortPair peer_;
+  // The hostname and port of the endpoint.  This is not necessarily the one
+  // specified by the URL, due to Alternate-Protocol or fixed testing ports.
+  HostPortPair endpoint_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_