MD Settings: Allow editing a cookie site exception.

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.
 
 /**
  * An example empty pref.
  * @type {SiteSettingsPref}
  */
 var prefsEmpty = {
   defaults: {
@@ skipping 224 matching lines @@
       primaryPattern, secondaryPattern, contentType, incognito) {
     this.methodCalled('resetCategoryPermissionForOrigin',
         [primaryPattern, secondaryPattern, contentType, incognito]);
     return Promise.resolve();
   },
 
   /** @override */
   setCategoryPermissionForOrigin: function(
       primaryPattern, secondaryPattern, contentType, value, incognito) {
     this.methodCalled('setCategoryPermissionForOrigin',
-        [primaryPattern, secondaryPattern, contentType, value]);
+        [primaryPattern, secondaryPattern, contentType, value, incognito]);
     return Promise.resolve();
   },
 
   /** @override */
   fetchZoomLevels: function() {
     cr.webUIListenerCallback('onZoomLevelsChanged', this.zoomList_);
     this.methodCalled('fetchZoomLevels');
   },
 
   /** @override */
@@ skipping 38 matching lines @@
   /** @override */
   setProtocolDefault: function() {
     this.methodCalled('setProtocolDefault', arguments);
   },
 
   /** @override */
   removeProtocolHandler: function() {
     this.methodCalled('removeProtocolHandler', arguments);
   }
 };