WebUI: For cr-dialog, make Enter key ignore disabled or hidden buttons

ui/webui/resources/cr_elements/cr_dialog/cr_dialog.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 'cr-dialog' is a component for showing a modal dialog. If the
  * dialog is closed via close(), a 'close' event is fired. If the dialog is
  * canceled via cancel(), a 'cancel' event is fired followed by a 'close' event.
  * Additionally clients can inspect the dialog's |returnValue| property inside
  * the 'close' event listener to determine whether it was canceled or just
@@ skipping 100 matching lines @@
   /**
    * @param {!Event} e
    * @private
    */
   onKeypress_: function(e) {
     if (e.target != this)
       return;
     if (e.key != 'Enter')
       return;
 
-    var actionButton = this.querySelector('.action-button');
-    if (actionButton && !actionButton.disabled) {
+    var actionButton =
+        this.querySelector('.action-button:not([disabled]):not([hidden])');
+    if (actionButton) {
       actionButton.click();
       e.preventDefault();
     }
   },
 });