"Reverting 22400"

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

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 08a6b089b464da0343d87cc98e2328cb7c54bd49..3b3ca0b26dfd5e8516cdd8d37fc41303a0d3d918 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -137,32 +137,11 @@ class _ChildrenElementList extends ListBase<Element> {
   }
 }
 
-/** 
- * An immutable list containing HTML elements. This list contains some
- * additional methods for ease of CSS manipulation on a group of elements.
- */
-abstract class ElementList<T extends Element> extends ListBase<T> {
-  /**
-   * The union of all CSS classes applied to the elements in this list.
-   *
-   * This set makes it easy to add, remove or toggle (add if not present, remove
-   * if present) the classes applied to a collection of elements.
-   *
-   *     htmlList.classes.add('selected');
-   *     htmlList.classes.toggle('isOnline');
-   *     htmlList.classes.remove('selected');
-   */
-  CssClassSet get classes;
-
-  /** Replace the classes with `value` for every element in this list. */
-  set classes(Iterable<String> value);
-}
-
 // TODO(jacobr): this is an inefficient implementation but it is hard to see
 // a better option given that we cannot quite force NodeList to be an
 // ElementList as there are valid cases where a NodeList JavaScript object
 // contains Node objects that are not Elements.
-class _FrozenElementList<T extends Element> extends ListBase<T> implements ElementList {
+class _FrozenElementList<T extends Element> extends ListBase<T> {
   final List<Node> _nodeList;
 
   _FrozenElementList._wrap(this._nodeList);
@@ -188,12 +167,30 @@ class _FrozenElementList<T extends Element> extends ListBase<T> implements Eleme
   Element get last => _nodeList.last;
 
   Element get single => _nodeList.single;
+}
 
-  CssClassSet get classes => new _MultiElementCssClassSet(
-      _nodeList.where((e) => e is Element));
+class _ElementCssClassSet extends CssClassSet {
 
-  void set classes(Iterable<String> value) {
-    _nodeList.where((e) => e is Element).forEach((e) => e.classes = value);
+  final Element _element;
+
+  _ElementCssClassSet(this._element);
+
+  Set<String> readClasses() {
+    var s = new LinkedHashSet<String>();
+    var classname = _element.$dom_className;
+
+    for (String name in classname.split(' ')) {
+      String trimmed = name.trim();
+      if (!trimmed.isEmpty) {
+        s.add(trimmed);
+      }
+    }
+    return s;
+  }
+
+  void writeClasses(Set<String> s) {
+    List list = new List.from(s);
+    _element.$dom_className = s.join(' ');
   }
 }
 
@@ -292,7 +289,7 @@ $(ANNOTATIONS)abstract class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
    *
    *     var items = element.query('.itemClassName');
    */
-  ElementList queryAll(String selectors) =>
+  List<Element> queryAll(String selectors) =>
     new _FrozenElementList._wrap($dom_querySelectorAll(selectors));
 
   /**