Adding socks4 support for chromium. tested for windows and linux....

net/proxy/proxy_config.cc

 // Copyright (c) 2006-2008 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/proxy/proxy_config.h"
 
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 
 namespace net {
@@ skipping 38 matching lines @@
       // this is a regular proxy server configuration, i.e. proxies
       // are not configured per protocol.
       if (!proxy_server_for_scheme.GetNext()) {
         if (type == TYPE_PROXY_PER_SCHEME)
           continue;  // Unexpected.
         single_proxy = ProxyServer::FromURI(url_scheme);
         type = TYPE_SINGLE_PROXY;
         return;
       }
 
+      // If the proxy settings has only socks and others blank,
+      // make that the default for all the proxies
+      // This gets hit only on windows when using IE settings.
+      if (url_scheme == "socks") {
+        std::string proxy_server_string = "socks://";
+        proxy_server_string.append(proxy_server_for_scheme.token());
+        single_proxy = ProxyServer::FromURI(proxy_server_string);
+        type = TYPE_SINGLE_PROXY;
+        return;
+      }
+
       // Trim whitespace off the url scheme.
       TrimWhitespaceASCII(url_scheme, TRIM_ALL, &url_scheme);
 
       // Add it to the per-scheme mappings (if supported scheme).
       type = TYPE_PROXY_PER_SCHEME;
       if (const ProxyServer* entry = MapSchemeToProxy(url_scheme))
         *const_cast<ProxyServer*>(entry) =
             ProxyServer::FromURI(proxy_server_for_scheme.token());
     }
   }
@@ skipping 134 matching lines @@
          it != config.proxy_bypass.end(); ++it) {
       out << "    " << *it << "\n";
     }
     out << "  }\n";
   }
 
   out << "  id: " << config.id() << "\n"
       << "}";
   return out;
 }