Fix KeyEvent keyIdentifier is unsupported error message.

tools/dom/src/KeyboardEventStream.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
 
 /**
  * Internal class that does the actual calculations to determine keyCode and
  * charCode for keydown, keypress, and keyup events for all browsers.
  */
@@ skipping 297 matching lines @@
     event._shadowKeyCode = _normalizeKeyCodes(event);
     // Technically a "keydown" event doesn't have a charCode. This is
     // calculated nonetheless to provide us with more information in giving
     // as much information as possible on keypress about keycode and also
     // charCode.
     event._shadowCharCode = _findCharCodeKeyDown(event);
     if (_keyDownList.length > 0 && event.keyCode != _keyDownList.last.keyCode &&
         !_firesKeyPressEvent(event)) {
       // Some browsers have quirks not firing keypress events where all other
       // browsers do. This makes them more consistent.
-      processKeyPress(event);
+      processKeyPress(e);
     }
     _keyDownList.add(event);
     _dispatch(event);
   }
 
   /** Handle keypress events. */
   void processKeyPress(KeyboardEvent event) {
     var e = new KeyEvent(event);
     // IE reports the character code in the keyCode field for keypress events.
     // There are two exceptions however, Enter and Escape.
@@ skipping 66 matching lines @@
       new _KeyboardEventHandler('keypress').forTarget(target);
 
   /** Named constructor to produce a stream for onKeyUp events. */
   static Stream<KeyEvent> onKeyUp(EventTarget target) =>
       new _KeyboardEventHandler('keyup').forTarget(target);
 
   /** Named constructor to produce a stream for onKeyDown events. */
   static Stream<KeyEvent> onKeyDown(EventTarget target) =>
     new _KeyboardEventHandler('keydown').forTarget(target);
 }