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

net/net.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 249 matching lines @@
         'proxy/proxy_service.cc',
         'proxy/proxy_service.h',
         'socket/client_socket.cc',
         'socket/client_socket.h',
         'socket/client_socket_factory.cc',
         'socket/client_socket_factory.h',
         'socket/client_socket_handle.cc',
         'socket/client_socket_handle.h',
         'socket/client_socket_pool.h',
         'socket/socket.h',
+        'socket/socks_client_socket.cc',
+        'socket/socks_client_socket.h',
         'socket/ssl_client_socket.h',
         'socket/ssl_client_socket_mac.cc',
         'socket/ssl_client_socket_nss.cc',
         'socket/ssl_client_socket_win.cc',
         'socket/ssl_client_socket_win.h',
         'socket/ssl_test_util.cc',
         'socket/ssl_test_util.h',
         'socket/tcp_client_socket.h',
         'socket/tcp_client_socket_libevent.cc',
         'socket/tcp_client_socket_libevent.h',
@@ skipping 397 matching lines @@
           'sources': [
             'tools/dump_cache/dump_cache.cc',
             'tools/dump_cache/dump_files.cc',
             'tools/dump_cache/upgrade.cc',
           ],
         },
       ],
     }],
   ],
 }