Add md_settings to WATCHLISTS for c/b/resources/settings.

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 413 matching lines @@
                   'ui/gfx/platform_font_linux.*|'\
                   'ui/gfx/render_text_harfbuzz.*',
     },
     'linux_sandboxing': {
       'filepath': 'sandbox/linux/',
     },
     'linux_seccomp_bpf': {
       'filepath': 'content/common/sandbox.*linux.cc',
     },
     'md_settings': {
-      'filepath': 'ui/webui/resources/cr_element|'\
-                  'chrome/browser/resources/md_settings/',
+      'filepath': 'ui/webui/resources/cr_element'\
+                  '|chrome/browser/resources/md_settings/'\
+                  '|chrome/browser/resources/settings/',
     },
     'media': {
       'filepath': 'media/|third_party/(ffmpeg|openmax)/|webmediaplayer|'\
         'audio_message_filter|video_layer|media_internals',
     },
     'media_galleries': {
       'filepath': 'chrome/browser/extensions/api/media_galleries/'\
                   '|chrome/browser/media_galleries/'\
                   '|chrome/browser/storage_monitor/'\
                   '|chrome/common/media_galleries/'\
@@ skipping 622 matching lines @@
                      'mcasas+watch@chromium.org',
                      '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'],
   },
 }