Make KeyboardEvent have direct fields for keyCode/charCode, as they're no longer inherited from UIE…

tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate

Index: tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
diff --git a/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate b/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
index d66a2cf57934dc7b743a48ee1ac3dc07306a5e2f..28374c1c26fc3294aaf3f01d3c3d1a32a865c98a 100644
--- a/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
+++ b/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
@@ -65,10 +65,10 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
   }
 
   @DomName('KeyboardEvent.keyCode')
-  int get keyCode => _keyCode;
+  final int keyCode;
 
   @DomName('KeyboardEvent.charCode')
-  int get charCode => _charCode;
+  final int charCode;
 
   @DomName('KeyboardEvent.which')
   int get which => _which;