Add change to dartium source file in addition to the dart2js file.

tools/dom/src/dartium_KeyEvent.dart

 /**
  * A custom KeyboardEvent that attempts to eliminate cross-browser
  * inconsistencies, and also provide both keyCode and charCode information
  * for all key events (when such information can be determined).
  *
  * KeyEvent tries to provide a higher level, more polished keyboard event
  * information on top of the "raw" [KeyboardEvent].
  *
  * This class is very much a work in progress, and we'd love to get information
  * on how we can make this class work with as many international keyboards as
@@ skipping 36 matching lines @@
   /** Construct a KeyEvent with [parent] as the event we're emulating. */
   KeyEvent(KeyboardEvent parent) {
     _parent = parent;
     _shadowAltKey = _realAltKey;
     _shadowCharCode = _realCharCode;
     _shadowKeyCode = _realKeyCode;
   }
 
   /** Accessor to provide a stream of KeyEvents on the desired target. */
   static EventStreamProvider<KeyEvent> keyDownEvent =
-    _KeyboardEventHandler('keydown');
+    new _KeyboardEventHandler('keydown');

[Emily Fortuna, 2013/03/25 20:32:59]

This corresponding change in the dart2js_KeyEvent.dart file was in the original
checkout. Apparently this file missed that change though.

   /** Accessor to provide a stream of KeyEvents on the desired target. */
   static EventStreamProvider<KeyEvent> keyUpEvent =
-    _KeyboardEventHandler('keyup');
+    new _KeyboardEventHandler('keyup');
   /** Accessor to provide a stream of KeyEvents on the desired target. */
   static EventStreamProvider<KeyEvent> keyPressEvent =
-    _KeyboardEventHandler('keypress');
+    new _KeyboardEventHandler('keypress');
 
   /** True if the altGraphKey is pressed during this event. */
   bool get altGraphKey => _parent.altGraphKey;
   bool get bubbles => _parent.bubbles;
   /** True if this event can be cancelled. */
   bool get cancelable => _parent.cancelable;
   bool get cancelBubble => _parent.cancelBubble;
   void set cancelBubble(bool cancel) {
     _parent.cancelBubble = cancel;
   }
@@ skipping 49 matching lines @@
     throw new UnsupportedError("keyIdentifier is unsupported.");
   }
   void $dom_initKeyboardEvent(String type, bool canBubble, bool cancelable,
       Window view, String keyIdentifier, int keyLocation, bool ctrlKey,
       bool altKey, bool shiftKey, bool metaKey,
       bool altGraphKey) {
     throw new UnsupportedError(
         "Cannot initialize a KeyboardEvent from a KeyEvent.");
   }
 }