replace platform conditions with os_posix and os_bsd where applicable

base/base.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 347 matching lines @@
             # test_suite initializes GTK.
             '../build/linux/system.gyp:gtk',
           ],
         }],
         ['os_posix==0', {
           'sources!': [
             'test/scoped_locale.cc',
             'test/scoped_locale.h',
           ],
         }],
-        ['OS=="openbsd"', {
+        ['os_bsd==1', {
           'sources!': [
             'test/test_file_util_linux.cc',
           ],
         }],
       ],
       'sources': [
         'perftimer.cc',
         'test/mock_chrome_application_mac.h',
         'test/mock_chrome_application_mac.mm',
         'test/mock_time_provider.cc',
@@ skipping 67 matching lines @@
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
             },
           },
         },
       ],
     }],
   ],
 }