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

net/proxy/proxy_config.cc

Index: net/proxy/proxy_config.cc
===================================================================
--- net/proxy/proxy_config.cc	(revision 19002)
+++ net/proxy/proxy_config.cc	(working copy)
@@ -56,6 +56,17 @@
         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);