Port the SVG code to the wrapperless DOM.

client/dom/templates/html/impl/impl_Element.darttemplate

 // 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.
 
 // TODO(jacobr): use _Lists.dart to remove some of the duplicated
 // functionality.
 class _ChildrenElementList implements ElementList {
   // Raw Element.
   final _ElementImpl _element;
   final _HTMLCollectionImpl _childElements;
@@ skipping 79 matching lines @@
 
   Element add(_ElementImpl value) {
     _element._appendChild(value);
     return value;
   }
 
   Element addLast(_ElementImpl value) => add(value);
 
   Iterator<Element> iterator() => _toList().iterator();
 
-  void addAll(Collection<_ElementImpl> collection) {
+  void addAll(Collection<Element> collection) {
     for (_ElementImpl element in collection) {
       _element._appendChild(element);
     }
   }
 
   void sort(int compare(Element a, Element b)) {
     throw const UnsupportedOperationException('TODO(jacobr): should we impl?');
   }
 
   void copyFrom(List<Object> src, int srcStart, int dstStart, int count) {
@@ skipping 421 matching lines @@
      return getComputedStyle('');
   }
 
   Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement) {
     return _createMeasurementFuture(
         () => _window._getComputedStyle(this, pseudoElement),
         new Completer<CSSStyleDeclaration>());
   }
 $!MEMBERS
 }