Revert "Rework Element constructors"

lib/dom/dom.dart

Index: lib/dom/dom.dart
diff --git a/lib/dom/dom.dart b/lib/dom/dom.dart
index 04509dfd576851c9ace0d43bc997809ba5f0ef2d..5343b82edaf0dc7bf81e3f5a7c56e5f15b3bad83 100644
--- a/lib/dom/dom.dart
+++ b/lib/dom/dom.dart
@@ -1675,14 +1675,6 @@ interface DOMStringList extends List<String> {
 
 // WARNING: Do not edit - generated code.
 
-interface DOMStringMap {
-}
-// 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.
-
-// WARNING: Do not edit - generated code.
-
 interface DOMTokenList {
 
   final int length;