Enable signed/unsigned warning in libaddressinput unit tests on Windows.

third_party/libaddressinput/libaddressinput.gyp

 # Copyright 2013 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.
 {
   'includes': ['src/cpp/libaddressinput.gypi'],
   'variables': {
     'libaddressinput_test_data_dir%': 'src/third_party/libaddressinput/src/testdata',
     'libaddressinput_util_files': [
       'src/cpp/src/address_data.cc',
       'src/cpp/src/address_field.cc',
@@ skipping 126 matching lines @@
         '<@(libaddressinput_test_files)',
         'chromium/addressinput_util_unittest.cc',
         'chromium/chrome_address_validator_unittest.cc',
         'chromium/chrome_metadata_source_unittest.cc',
         'chromium/chrome_storage_impl_unittest.cc',
         'chromium/fallback_data_store_unittest.cc',
         'chromium/storage_test_runner.cc',
         'chromium/string_compare_unittest.cc',
         'chromium/trie_unittest.cc',
       ],
-      'conditions': [
-        ['OS=="win"', {
-          # TODO(rouslan): Enable signed/unsigned warning after bumping to
-          # https://code.google.com/p/libaddressinput/source/detail?r=327
-          'msvs_disabled_warnings': [
-            4018,
-          ],
-        }],
-      ],
       'defines': [
         'TEST_DATA_DIR="<(libaddressinput_test_data_dir)"',
       ],
       'include_dirs': [
         '../../',
         'src/cpp/src/',
       ],
       'dependencies': [
         '../../base/base.gyp:base_prefs',
         '../../base/base.gyp:run_all_unittests',
         '../../net/net.gyp:net_test_support',
         '../../testing/gtest.gyp:gtest',
         'libaddressinput',
         'libaddressinput_util',
       ],
     },
   ],
 }