Test tidying: use "escape" and "backspace" with eventSender.keyDown()

LayoutTests/editing/selection/5354455-1.html

Index: LayoutTests/editing/selection/5354455-1.html
diff --git a/LayoutTests/editing/selection/5354455-1.html b/LayoutTests/editing/selection/5354455-1.html
index f626ee7d8cedd957445b884519398c51880470c6..6361c2e2200f788ccf0b44a08e77539aca87bb35 100644
--- a/LayoutTests/editing/selection/5354455-1.html
+++ b/LayoutTests/editing/selection/5354455-1.html
@@ -23,7 +23,7 @@ function test(platform, result) {
     // Right click on the paragraph break to select it.
     eventSender.contextClick();
     // esc key to kill the context menu.
-    eventSender.keyDown(String.fromCharCode(0x001B), null);
+    eventSender.keyDown("escape", null);
     
     document.getElementById(result).innerHTML = window.getSelection().type;
 }