Revert "Add some sweet XML classes."

client/html/src/XMLElement.dart

Index: client/html/src/XMLElement.dart
diff --git a/client/html/src/XMLElement.dart b/client/html/src/XMLElement.dart
deleted file mode 100644
index 3d9ea8314969c6341a4e1b9175a04e3640f00c22..0000000000000000000000000000000000000000
--- a/client/html/src/XMLElement.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-// 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.
-
-interface XMLElement extends Element default XMLElementWrappingImplementation {
-
-  XMLElement.tag(String tag);
-  XMLElement.xml(String tag);
-
-  XMLElement clone(bool deep);
-}