Site Settings Desktop: Support SessionOnly for cookies on Site Details page.

chrome/browser/resources/settings/site_settings/site_details_permission.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview
  * 'site-details-permission' handles showing the state of one permission, such
  * as Geolocation, for a given origin.
  */
 Polymer({
@@ skipping 23 matching lines @@
    * @param {string} left The first origin to compare.
    * @param {string} right The second origin to compare.
    * @return {boolean} True if the origins are the same.
    * @private
    */
   sameOrigin_: function(left, right) {
     return this.removePatternWildcard(left) ==
         this.removePatternWildcard(right);
   },
 
+  /** @private */
+  isCookiesCategory_: function(category) {
+    return category == settings.ContentSettingsTypes.COOKIES;
+  },
+
   /**
    * Sets the site to display.
    * @param {!SiteException} site The site to display.
    * @private
    */
   siteChanged_: function(site) {
     this.$.details.hidden = true;
 
     this.browserProxy.getExceptionList(this.category).then(
         function(exceptionList) {
@@ skipping 42 matching lines @@
    * Handles the category permission changing for this origin.
    * @param {!{detail: !{item: !{dataset: !{permissionValue: string}}}}} event
    */
   onPermissionMenuIronActivate_: function(event) {
     var value = event.detail.item.dataset.permissionValue;
     this.browserProxy.setCategoryPermissionForOrigin(
         this.site.origin, this.site.embeddingOrigin, this.category, value,
         this.site.incognito);
   },
 });