Remove the implicit fallback to DIRECT when proxies fail. This better matches...

net/proxy/proxy_server.h

 // Copyright (c) 2009 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_PROXY_PROXY_SERVER_H_
 #define NET_PROXY_PROXY_SERVER_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_MACOSX)
@@ skipping 89 matching lines @@
   //
   // Examples:
   //   "PROXY foopy:19"   {scheme=HTTP, host="foopy", port=19}
   //   "DIRECT"           {scheme=DIRECT}
   //   "SOCKS5 foopy"     {scheme=SOCKS5, host="foopy", port=1080}
   //   "BLAH xxx:xx"      INVALID
   static ProxyServer FromPacString(const std::string& pac_string);
   static ProxyServer FromPacString(std::string::const_iterator pac_string_begin,
                                    std::string::const_iterator pac_string_end);
 
+  // Returns a ProxyServer representing DIRECT connections.
+  static ProxyServer Direct() {
+    return ProxyServer(SCHEME_DIRECT, std::string(), -1);
+  }
+
 #if defined(OS_MACOSX)
   // Utility function to pull out a host/port pair from a dictionary and return
   // it as a ProxyServer object. Pass in a dictionary that has a  value for the
   // host key and optionally a value for the port key. In the error condition
   // where the host value is especially malformed, returns an invalid
   // ProxyServer.
   static ProxyServer FromDictionary(Scheme scheme,
                                     CFDictionaryRef dict,
                                     CFStringRef host_key,
                                     CFStringRef port_key);
@@ skipping 22 matching lines @@
       std::string::const_iterator host_and_port_end);
 
   Scheme scheme_;
   std::string host_;
   int port_;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SERVER_H_