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

net/proxy/proxy_config_unittest.cc

 // 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.
 
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_config_service_common_unittest.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 static void ExpectProxyServerEquals(const char* expectation,
@@ skipping 152 matching lines @@
     {
       "ftp=ftp1 ; ftp=ftp2 ; ftp=ftp3",
 
       net::ProxyConfig::ProxyRules::TYPE_PROXY_PER_SCHEME,
       NULL,
       NULL,
       NULL,
       "ftp3:80",
     },
 
+    // Only socks proxy present, others being blank.
+    {  // NOLINT
+      "socks=foopy",
+
+      net::ProxyConfig::ProxyRules::TYPE_SINGLE_PROXY,
+      "socks4://foopy:1080",
+      NULL,
+      NULL,
+      NULL,
+    },
+
     // Include unsupported schemes -- they are discarded.
     {
       "crazy=foopy ; foo=bar ; https=myhttpsproxy",
 
       net::ProxyConfig::ProxyRules::TYPE_PROXY_PER_SCHEME,
       NULL,
       NULL,
       "myhttpsproxy:80",
       NULL,
     },
@@ skipping 41 matching lines @@
   };
 
   net::ProxyConfig config;
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
     config.ParseNoProxyList(tests[i].proxy_bypass_input);
     EXPECT_EQ(tests[i].flattened_output,
               net::FlattenProxyBypass(config.proxy_bypass));
   }
 }