Test cached PID using getpid instead of pthread_getattr_np.

WATCHLISTS

 # 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.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 1962 matching lines @@
                   'tburkard+watch@chromium.org'],
     'push_messaging': ['harkness+watch@chromium.org',
                        'johnme+watch@chromium.org',
                        'peter@chromium.org'],
     'remoting': ['chromoting-reviews@chromium.org'],
     'rlz_id': ['alito+watch@chromium.org',
                'gab+watch@chromium.org',
                'robertshield+watch@chromium.org'],
     'safe_browsing': ['grt+watch@chromium.org'],
     'safe_browsing_db': ['vakh+watch@chromium.org'],
-    'sandbox': ['rickyz+watch@chromium.org'],
     'scheduler': ['scheduler-bugs@chromium.org'],
     'screen_orientation': ['mlamouri+watch-screen-orientation@chromium.org'],
     'service_worker': ['horo+watch@chromium.org',
                        'jsbell+serviceworker@chromium.org',
                        'kinuko+serviceworker@chromium.org',
                        'michaeln@chromium.org',
                        'nhiroki@chromium.org',
                        'serviceworker-reviews@chromium.org',
                        'shimazu+serviceworker@chromium.org',
                        'tzik@chromium.org'],
@@ skipping 60 matching lines @@
                          'raymes+watch@chromium.org'],
     'windows_sandboxing': ['pennymac+watch@chromium.org',
                            'wfh+watch@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
     'xml': ['dominicc+watchlist@chromium.org'],
     'zoom': ['wjmaclean@chromium.org'],
   },
 }