Add a global on/off switch for content settings and expose a toggle on the Website Settings options…

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 265 matching lines @@
       'browser/component_updater/sw_reporter_installer_win.cc',
       'browser/component_updater/sw_reporter_installer_win.h',
       'browser/component_updater/swiftshader_component_installer.cc',
       'browser/component_updater/swiftshader_component_installer.h',
       'browser/content_settings/content_settings_default_provider.cc',
       'browser/content_settings/content_settings_default_provider.h',
       'browser/content_settings/content_settings_observable_provider.cc',
       'browser/content_settings/content_settings_observable_provider.h',
       'browser/content_settings/content_settings_origin_identifier_value_map.cc',
       'browser/content_settings/content_settings_origin_identifier_value_map.h',
+      'browser/content_settings/content_settings_override_provider.cc',
+      'browser/content_settings/content_settings_override_provider.h',
       'browser/content_settings/content_settings_policy_provider.cc',
       'browser/content_settings/content_settings_policy_provider.h',
       'browser/content_settings/content_settings_pref_provider.cc',
       'browser/content_settings/content_settings_pref_provider.h',
       'browser/content_settings/content_settings_usages_state.cc',
       'browser/content_settings/content_settings_usages_state.h',
       'browser/content_settings/content_settings_utils.cc',
       'browser/content_settings/content_settings_utils.h',
       'browser/content_settings/cookie_settings.cc',
       'browser/content_settings/cookie_settings.h',
@@ skipping 3260 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }