Update WATCHLISTS and OWNERS for chromedriver

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 1860 matching lines @@
                                  'martijn+crwatch@martijnc.be',
                                  'rsleevi+watch@chromium.org'],
     'chrome_elf': ['caitkp+watch@chromium.org',
                    'pennymac+watch@chromium.org'],
     'chrome_grc': ['chrome-grc-reviews@chromium.org'],
     'chrome_views': ['tfarina@chromium.org'],
     'chromecast': ['alokp+watch@chromium.org',
                    'halliwell+watch@chromium.org',
                    'lcwu+watch@chromium.org'],
     'chromecast_public': ['gfhuang+watch@chromium.org'],
-    'chromedriver': ['samuong+watch@chromium.org'],
+    'chromedriver': ['johnchen+watch@chromium.org'],
     'chromeos': ['oshima+watch@chromium.org'],
     'chromeos_attestation': ['dkrahn+watch@chromium.org'],
     'chromeos_calculator': ['dharcourt@chromium.org'],
     'chromeos_dbus': ['hashimoto+watch@chromium.org'],
     'chromeos_geolocation': ['alemate+watch@chromium.org'],
     'chromeos_login': ['achuith+watch@chromium.org',
                        'alemate+watch@chromium.org'],
     'chromeos_net': ['stevenjb+watch@chromium.org'],
     'chromeos_power': ['derat+watch@chromium.org'],
     'chromeos_timezone': ['alemate+watch@chromium.org'],
@@ skipping 346 matching lines @@
                          'msramek+watch@chromium.org',
                          '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'],
     'zoom': ['wjmaclean@chromium.org'],
   },
 }