Fix KeyEvent keyIdentifier is unsupported error message.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 9e93000819b199becce63e9cc77f216d017e7213..741f5730000e241f98719e916071b691ac70120d 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -31027,7 +31027,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
     // charCode.
     event._shadowCharCode = _findCharCodeKeyDown(event);
     if (_keyDownList.length > 0 && event.keyCode != _keyDownList.last.keyCode &&
-        !_firesKeyPressEvent(event)) {
+        !_firesKeyPressEvent(e)) {
       // Some browsers have quirks not firing keypress events where all other
       // browsers do. This makes them more consistent.
       processKeyPress(event);