[MD settings] clear incognito only checkbox

chrome/test/data/webui/settings/test_site_settings_prefs_browser_proxy.js

 // Copyright 2016 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.
 
 /**
  * Only used for tests.
  * @typedef {{
  *   auto_downloads: !Array<!RawSiteException>},
  *   background_sync: !Array<!RawSiteException>},
  *   camera: !Array<!RawSiteException>},
@@ skipping 75 matching lines @@
     'observeProtocolHandlers',
     'observeProtocolHandlersEnabledState',
     'reloadCookies',
     'removeCookie',
     'removeProtocolHandler',
     'removeUsbDevice',
     'removeZoomLevel',
     'resetCategoryPermissionForOrigin',
     'setCategoryPermissionForOrigin',
     'setDefaultValueForContentType',
-    'setProtocolDefault'
+    'setProtocolDefault',
+    'updateIncognitoStatus',
   ]);
 
   /** @private {boolean} */
   this.hasIncognito_ = false;
 
   /** @private {!SiteSettingsPref} */
   this.prefs_ = prefsEmpty;
 
   /** @private {!Array<ZoomLevelEntry>} */
   this.zoomList_ = [];
@@ skipping 257 matching lines @@
   },
 
   /** @override */
   setProtocolDefault: function() {
     this.methodCalled('setProtocolDefault', arguments);
   },
 
   /** @override */
   removeProtocolHandler: function() {
     this.methodCalled('removeProtocolHandler', arguments);
+  },
+
+  /** @override */
+  updateIncognitoStatus: function() {
+    this.methodCalled('updateIncognitoStatus', arguments);
   }
 };