Increase warning level for windows

Source/config.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
   'targets': [
   {
     'target_name': 'config',
     'type': 'none',
     'direct_dependent_settings': {
       'include_dirs': [
         '.',
         '..',
       ],
       'msvs_disabled_warnings': [
-        4138, 4244, 4291, 4305, 4344, 4355, 4521, 4099, 4800, 4996, 4714, 4324,
+        4305, 4324, 4714, 4800, 4996,
       ],
       'variables': {
         'chromium_code': 1,
       },
       'conditions': [
         ['OS=="win" and component=="shared_library"', {
           'defines': [
             'USING_V8_SHARED',
           ],
         }],
@@ skipping 59 matching lines @@
     ],
     'direct_dependent_settings': {
       'cflags!': ['-Wglobal-constructors'],
       'xcode_settings': {
         'WARNING_CFLAGS!': ['-Wglobal-constructors'],
       },
     },
   }
   ],
 }