Make ProcessWatcher use kqueues on Mac.

base/base.gypi

 # Copyright (c) 2009 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 269 matching lines @@
                 ['exclude', '_nss\.cc$'],
               ],
               'sources!': [
                 'atomicops_internals_x86_gcc.cc',
                 'base_paths_posix.cc',
                 'directory_watcher_inotify.cc',
                 'linux_util.cc',
                 'message_pump_glib.cc',
                 'nss_init.cc',
                 'nss_init.h',
-                'time_posix.cc',
               ],
           },],
           [ 'OS != "linux"', {
               'sources!': [
                 # Not automatically excluded by the *linux.cc rules.
                 'setproctitle_linux.c',
                 'setproctitle_linux.h',
               ],
             },
           ],
@@ skipping 287 matching lines @@
           'configurations': {
             'Common': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }