[MD Settings] Add a menu option to clear a cached credit card.

chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.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.
 
 /**
  * @fileoverview 'settings-autofill-section' is the section containing saved
  * addresses and credit cards for use in autofill.
  */
 (function() {
   'use strict';
@@ skipping 101 matching lines @@
      * @private
      */
     onCreditCardMenuTap_: function(e) {
       // Close the other menu.
       this.$.addressSharedMenu.closeMenu();
 
       var menuEvent = /** @type {!{model: !{item: !Object}}} */(e);
       var creditCard = /** @type {!chrome.autofillPrivate.CreditCardEntry} */(
           menuEvent.model.item);
       this.$.menuRemoveCreditCard.hidden = !creditCard.metadata.isLocal;
+      this.$.menuClearCreditCard.hidden = !creditCard.metadata.isCached;
       this.$.creditCardSharedMenu.toggleMenu(
           Polymer.dom(e).localTarget, creditCard);
       e.stopPropagation();  // Prevent the tap event from closing the menu.
     },
 
     /**
      * Handles tapping on the "Add credit card" button.
      * @param {!Event} e
      * @private
      */
@@ skipping 29 matching lines @@
      * Handles tapping on the "Remove" credit card button.
      * @private
      */
     onMenuRemoveCreditCardTap_: function() {
       var menu = this.$.creditCardSharedMenu;
       this.fire('remove-credit-card', menu.itemData);
       menu.closeMenu();
     },
 
     /**
+     * Handles tapping on the "Clear copy" button for cached credit cards.
+     * @private
+     */
+    onMenuClearCreditCardTap_: function() {
+      var menu = this.$.creditCardSharedMenu;
+      this.fire('clear-credit-card', menu.itemData);
+      menu.closeMenu();
+    },
+
+    /**
      * Closes the overflow menus.
      * @private
      */
     closeMenu_: function() {
       this.$.addressSharedMenu.closeMenu();
       this.$.creditCardSharedMenu.closeMenu();
     },
   });
 })();