use os_bsd and OS_BSD and add some OS_FREEBSD conditions

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 203 matching lines @@
           'platform_file.cc',
           'platform_file.h',
           'platform_file_posix.cc',
           'platform_file_win.cc',
           'port.h',
           'process.h',
           'process_linux.cc',
           'process_posix.cc',
           'process_util.cc',
           'process_util.h',
+          'process_util_freebsd.cc',
           'process_util_linux.cc',
           'process_util_mac.mm',
           'process_util_openbsd.cc',
           'process_util_posix.cc',
           'process_util_win.cc',
           'process_win.cc',
           'profiler/scoped_profile.cc',
           'profiler/scoped_profile.h',
           'profiler/tracked_time.cc',
           'profiler/tracked_time.h',
@@ skipping 199 matching lines @@
           }, {
             'sources!' : [ 'message_pump_gtk.cc', ],
             'sources/' : [ [ 'include', '^message_pump_x\\.cc$', ] ],
           }],
           [ 'use_wayland==1', {
             'sources/': [
               [ 'exclude', '^message_pump_gtk\\.cc$',],
               [ 'exclude', '^message_pump_x\\.cc$',],
             ],
           }],
-          [ 'OS != "linux" and OS != "openbsd"', {
+          [ 'OS != "linux" and os_bsd != 1', {
               'sources!': [
                 # Not automatically excluded by the *linux.cc rules.
                 'linux_util.cc',
               ],
             },
           ],
           [ 'OS == "android"', {
             'sources!': [
               'files/file_path_watcher_kqueue.cc',
               'system_monitor/system_monitor_posix.cc',
@@ skipping 57 matching lines @@
             ],
           }],
           [ 'OS == "mac"', {
             'sources/': [
               ['exclude', '^files/file_path_watcher_stub\\.cc$'],
               ['exclude', '^base_paths_posix\\.cc$'],
               ['exclude', '^native_library_posix\\.cc$'],
               ['exclude', '^sys_string_conversions_posix\\.cc$'],
             ],
           }],
-          [ 'OS == "openbsd"', {
+          [ 'os_bsd==1', {
             'sources/': [
               ['exclude', '^files/file_path_watcher_linux\\.cc$'],
               ['exclude', '^files/file_path_watcher_stub\\.cc$'],
               ['exclude', '^file_util_linux\\.cc$'],
               ['exclude', '^process_linux\\.cc$'],
               ['exclude', '^process_util_linux\\.cc$'],
               ['exclude', '^sys_info_linux\\.cc$'],
             ],
           }],
         ],
@@ skipping 334 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }