MD Settings: Migrate certificate entry action menu to settings-action-menu.

chrome/browser/resources/settings/certificate_manager_page/certificate_subentry.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-certificate-subentry represents an SSL certificate
  * sub-entry.
  */
 
 cr.define('settings', function() {
@@ skipping 133 matching lines @@
    * @param {!CertificateSubnode} model
    * @return {boolean} Whether the certificate can be deleted.
    * @private
    */
   canDelete_: function(model) {
     return !model.readonly && !model.policy;
   },
 
   /** @private */
   closePopupMenu_: function() {
-    this.$$('iron-dropdown').close();
+    this.$$('dialog[is=settings-action-menu]').close();
+  },
+
+  /** @private */
+  onDotsTap_: function() {
+    var actionMenu = /** @type {!SettingsActionMenuElement} */(
+        this.$.menu.get());
+    actionMenu.showAt(assert(this.$$('paper-icon-button')));
   },
 });