Add jlklein to closure watchlist

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 893 matching lines @@
     'chromeos_net' : ['stevenjb+watch@chromium.org'],
     'chromeos_power' : ['derat+watch@chromium.org'],
     'chromeos_login' : ['dzhioev+watch@chromium.org'],
     'chromeos_webui': ['nkostylev+watch@chromium.org'],
     'clang_update': ['ukai+watch@chromium.org',
                      'dmikurube+clang@chromium.org',
                      'eugenis+clang@chromium.org',
                      'glider+clang@chromium.org'],
     'clipboard': ['dcheng@chromium.org'],
     'closure': ['dbeam+watch-closure@chromium.org',
-                'vitalyp+closure@chromium.org'],
+                'vitalyp+closure@chromium.org',
+                'jlklein+watch-closure@chromium.org'],
     'content': ['jam@chromium.org',
                 'darin-cc@chromium.org' ],
     'content_bluetooth': ['scheib+watch@chromium.org'],
     'content_input': ['jdduke+watch@chromium.org'],
     'content_renderer': [ 'mkwst+moarreviews-renderer@chromium.org',
                           'mlamouri+watch-content@chromium.org'],
     'content_shell': ['jochen+watch@chromium.org',
                       'mkwst+moarreviews-shell@chromium.org',
                       'mlamouri+watch-content@chromium.org'],
     'content_worker': ['kinuko+watch@chromium.org'],
@@ skipping 179 matching lines @@
                      'posciak+watch@chromium.org'],
     'website_settings': ['markusheintz@chromium.org'],
     'windows_sandboxing': ['wfh+watch@chromium.org'],
     'worker': ['jam@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
     'zoom': ['wjmaclean@chromium.org'],
   },
 }