Remove non-standardize key code names from event_sender.

third_party/WebKit/LayoutTests/editing/input/ctrl-up-down.html

 <div id="container">
 <p id="description"></p>
 Manual steps:
 <ol>
 <li>Move middle of the first paragraph</li>
 <li>Type Ctrl+Up</li>
 <li>Caret should be start of paragrah</li>
 <li>Type Ctrl+Down</li>
 <li>Caret should be next paragrah</li>
 <li>Do above step with Ctrl+Shift key to extend selection</li>
 </ol>
 Sample editable:
 <div id="sample" contenteditable="true"><p>This is the first paragraph. Key binding of Ctrl+Up/Down are available only Windows.</p><p>This is second paragraph. Do you want to have these key bindings on other platforms?</p>
 </div>
 </div>
 <script src="../../resources/js-test.js"></script>
 <script>
 description('Test Ctrl+Up/Down motion');
 function $(id) { return document.getElementById(id); }
 var sample = $('sample');
 var selection = window.getSelection();
 var range = document.createRange();
 range.setStart(sample.firstChild.firstChild, 3);
 selection.addRange(range);
 sample.focus();
 var paragraph1 = sample.firstChild.firstChild;
 var paragraph2 = sample.childNodes[1].firstChild;
 if (window.eventSender) {
-    eventSender.keyDown('upArrow', ['ctrlKey']);
+    eventSender.keyDown('ArrowUp', ['ctrlKey']);
     shouldBeEqualToString('selection.type', 'Caret');
     shouldBe('selection.focusNode', 'paragraph1');
     shouldBe('selection.focusOffset', '0');
 
-    eventSender.keyDown('downArrow', ['ctrlKey']);
+    eventSender.keyDown('ArrowDown', ['ctrlKey']);
     shouldBeEqualToString('selection.type', 'Caret');
     shouldBe('selection.focusNode', 'paragraph2');
     shouldBe('selection.focusOffset', '3');
 
-    eventSender.keyDown('downArrow', ['ctrlKey', 'shiftKey']);
+    eventSender.keyDown('ArrowDown', ['ctrlKey', 'shiftKey']);
     shouldBeEqualToString('selection.type', 'Range');
     shouldBe('selection.focusNode', 'paragraph2');
     shouldBe('selection.focusOffset', '84');
 
-    eventSender.keyDown('upArrow', ['ctrlKey', 'shiftKey']);
+    eventSender.keyDown('ArrowUp', ['ctrlKey', 'shiftKey']);
     shouldBeEqualToString('selection.type', 'Range');
     shouldBe('selection.focusNode', 'paragraph1');
     shouldBe('selection.focusOffset', '3');
 }
 if (window.testRunner)
     $('container').outerHTML = '';
 </script>