Update from https://crrev.com/315085

testing/gtest.gyp

 # Copyright (c) 2012 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': [
     'gtest.gypi',
   ],
   'targets': [
     {
@@ skipping 21 matching lines @@
         'defines': [
           'GTEST_HAS_POSIX_RE=0',
           'GTEST_LANG_CXX11=0',
         ],
       },
       'conditions': [
         ['OS == "mac" or OS == "ios"', {
           'sources': [
             'gtest_mac.h',
             'gtest_mac.mm',
+            'platform_test_mac.mm',
           ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
             ],
           },
         }],
-        ['OS == "mac"', {
-          'sources': [
-            'platform_test_mac.mm',
-          ],
-        }],
         ['OS == "ios"', {
           'dependencies' : [
             '<(DEPTH)/testing/iossim/iossim.gyp:iossim#host',
           ],
           'direct_dependent_settings': {
             'target_conditions': [
               # Turn all tests into bundles on iOS because that's the only
               # type of executable supported for iOS.
               ['_type=="executable"', {
                 'variables': {
@@ skipping 14 matching lines @@
                 ],
                 'mac_bundle_resources!': [
                   '<(ios_unittest_info_plist_path)',
                 ],
               }],
             ],
           },
           'sources': [
             'coverage_util_ios.cc',
             'coverage_util_ios.h',
-            'platform_test_ios.mm',
           ],
         }],
         ['OS=="ios" and asan==1', {
           'direct_dependent_settings': {
             'target_conditions': [
               # Package the ASan runtime dylib into the test app bundles.
               ['_type=="executable"', {
                 'postbuilds': [
                   {
                     'variables': {
@@ skipping 111 matching lines @@
     {
       'target_name': 'gtest_prod',
       'toolsets': ['host', 'target'],
       'type': 'none',
       'sources': [
         'gtest/include/gtest/gtest_prod.h',
       ],
     },
   ],
 }