Use iterator, moveNext(), current.

sdk/lib/html/templates/html/impl/impl_Element.darttemplate

Index: sdk/lib/html/templates/html/impl/impl_Element.darttemplate
diff --git a/sdk/lib/html/templates/html/impl/impl_Element.darttemplate b/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
index 0be29f58908798e2a977c284f95671c243dbacb5..5700dfd5308fd5931a2776f29f1eda401495a122 100644
--- a/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
+++ b/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
@@ -95,7 +95,7 @@ class _ChildrenElementList implements List {
 
   Element addLast(Element value) => add(value);
 
-  Iterator<Element> iterator() => _toList().iterator();
+  Iterator<Element> get iterator => _toList().iterator;
 
   void addAll(Collection<Element> collection) {
     for (Element element in collection) {
@@ -232,7 +232,7 @@ class _FrozenElementList implements List {
     throw new UnsupportedError('');
   }
 
-  Iterator<Element> iterator() => new _FrozenElementListIterator(this);
+  Iterator<Element> get iterator => new _FrozenElementListIterator(this);
 
   void addAll(Collection<Element> collection) {
     throw new UnsupportedError('');
@@ -281,21 +281,29 @@ class _FrozenElementListIterator implements Iterator<Element> {
   _FrozenElementListIterator(this._list);
 
   /**
-   * Gets the next element in the iteration. Throws a
-   * [StateError("No more elements")] if no element is left.
+   * Moves to the next element. Returns true if the iterator is positioned
+   * at an element. Returns false if it is positioned after the last element.
    */
-  Element next() {
-    if (!hasNext) {
-      throw new StateError("No more elements");
-    }
-
-    return _list[_index++];
+  bool moveNext() {
+    _index++;
+    if (_index < _list.length) return true;
+    _index = _list.length;
+    return false;
   }
 
   /**
-   * Returns whether the [Iterator] has elements left.
+   * Returns the element the [Iterator] is positioned at.
+   *
+   * Throws a [StateError] if the iterator is positioned before the first, or
+   * after the last element.
    */
-  bool get hasNext => _index < _list.length;
+  bool get current {
+    if (0 <= _index && _index < _list.length) {
+      return _list[_index];
+    }
+    // TODO(floitsch): adapt the error message.
+    throw new StateError("No more elements");
+  }
 }
 
 /**