Merge pull request #16263 from twbs/fix-16090

Use .dropdown-menu instead of ARIA roles for dropdown keydown event handler

js/dropdown.js

@@ -160,7 +160,6 @@
     .on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
     .on('click.bs.dropdown.data-api', toggle, Dropdown.prototype.toggle)
     .on('keydown.bs.dropdown.data-api', toggle, Dropdown.prototype.keydown)
-    .on('keydown.bs.dropdown.data-api', '[role="menu"]', Dropdown.prototype.keydown)
-    .on('keydown.bs.dropdown.data-api', '[role="listbox"]', Dropdown.prototype.keydown)
+    .on('keydown.bs.dropdown.data-api', '.dropdown-menu', Dropdown.prototype.keydown)
 
 }(jQuery);