Make codesighs build on Win64

third_party/codesighs/codesighs.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.
 
 {
+  'target_defaults': {
+      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
+  },
   'targets': [
     {
       'target_name': 'codesighs',
       'type': 'executable',
       'sources': [
         'codesighs.c',
       ],
     },
     {
       'target_name': 'maptsvdifftool',
@@ skipping 32 matching lines @@
           'target_name': 'nm2tsv',
           'type': 'executable',
           'sources': [
             'nm2tsv.c',
           ],
         },
       ],
     }],
   ],
 }