Disable size_t truncation warning (C4267) on BoringSSL Win64.

third_party/boringssl/boringssl.gyp

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       'target_name': 'boringssl',
       'type': '<(component)',
       'includes': [
         'boringssl.gypi',
       ],
       'sources': [
         '<@(boringssl_lib_sources)',
       ],
       'defines': [
         'BORINGSSL_IMPLEMENTATION',
         'BORINGSSL_NO_STATIC_INITIALIZER',
       ],
+      # TODO(davidben): Fix size_t truncations in BoringSSL.
+      # https://crbug.com/429039
+      'msvs_disabled_warnings': [ 4267, ],
       'conditions': [
         ['component == "shared_library"', {
           'defines': [
             'BORINGSSL_SHARED_LIBRARY',
           ],
         }],
         ['target_arch == "arm"', {
           'sources': [ '<@(boringssl_linux_arm_sources)' ],
         }],
         ['target_arch == "ia32"', {
@@ skipping 55 matching lines @@
           ['component == "shared_library"', {
             'defines': [
               'BORINGSSL_SHARED_LIBRARY',
             ],
           }],
         ],
       },
     },
   ],
 }