Remove non-standardize key code names from event_sender.

third_party/WebKit/LayoutTests/fast/forms/select-popup/popup-menu-crash-on-select.html

 <script src="../../../resources/js-test.js"></script>
 <script>
 window.onload = function() {
     var select = document.getElementById('test');
     select.onchange = function() { select.size = 30; }
     select.focus();
     if (window.eventSender) {
         eventSender.keyDown('\r', []);
-        eventSender.keyDown('downArrow');
+        eventSender.keyDown('ArrowDown');
         eventSender.keyDown('\r');
     } else {
         document.body.innerHTML = 'Needs eventSender.';
     }
 }
 </script>
 <p>PASS if this test doesn't cause a crash before finishing the test.</p>
 <select id="test">
 <option>
 <option>efgh