MD Settings: Migrate startup URL action menu to settings-action-menu.

chrome/browser/resources/settings/on_startup_page/startup_url_entry.js

Index: chrome/browser/resources/settings/on_startup_page/startup_url_entry.js
diff --git a/chrome/browser/resources/settings/on_startup_page/startup_url_entry.js b/chrome/browser/resources/settings/on_startup_page/startup_url_entry.js
index e088222948227e5e4b15c509c7cb2c6853fa9ad5..e0fff60b06c1111a5b7567aeb788bf994cc342dc 100644
--- a/chrome/browser/resources/settings/on_startup_page/startup_url_entry.js
+++ b/chrome/browser/resources/settings/on_startup_page/startup_url_entry.js
@@ -36,14 +36,21 @@ Polymer({
 
   /** @private */
   onRemoveTap_: function() {
-    this.$$('iron-dropdown').close();
+    this.$$('dialog[is=settings-action-menu]').close();
     settings.StartupUrlsPageBrowserProxyImpl.getInstance().removeStartupPage(
         this.model.modelIndex);
   },
 
   /** @private */
   onEditTap_: function() {
-    this.$$('iron-dropdown').close();
+    this.$$('dialog[is=settings-action-menu]').close();
     this.fire(settings.EDIT_STARTUP_URL_EVENT, this.model);
   },
+
+  /** @private */
+  onDotsTap_: function() {
+    var actionMenu = /** @type {!SettingsActionMenuElement} */(
+        this.$.menu.get());
+    actionMenu.showAt(assert(this.$.dots));
+  },
 });