Fix after bad merge.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 157ec0ed8bc3b86f0ae48d3603fbcf63294c9879..eb03c9f02459e6392e8d86b56782968827cd6900 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -8206,7 +8206,7 @@ class _ChildrenElementList implements List {
       throw new RangeError.range(index, 0, length);
     }
     if (index == length) {
-      _element.$dom_appendChild(element);
+      _element.append(element);
     } else {
       throw new UnimplementedError("insert on ElementLists");
     }
@@ -17431,7 +17431,7 @@ class _ChildNodeListLazy implements List {
       throw new RangeError.range(index, 0, length);
     }
     if (index == length) {
-      _this.$dom_appendChild(node);
+      _this.append(node);
     } else {
       this_.insertBefore(node, this[index]);
     }