Fix KeyEvent keyIdentifier is unsupported error message.

tools/dom/src/KeyboardEventStream.dart

Index: tools/dom/src/KeyboardEventStream.dart
diff --git a/tools/dom/src/KeyboardEventStream.dart b/tools/dom/src/KeyboardEventStream.dart
index 2e838d1fcb03dca2701b019c228366cabe2dc8d0..4d01f614e4945433684e192d290ac6b9a6ec5ca8 100644
--- a/tools/dom/src/KeyboardEventStream.dart
+++ b/tools/dom/src/KeyboardEventStream.dart
@@ -315,7 +315,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
         !_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);