Implement _ChildNodeListLazy.removeRange as throwing UnsupportedError

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 f35d89b584e9abf097232aadcbb4c78c471e14ba..b7fba4d1882add3eb4927bc32541d1d9bfec4d9e 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -26201,6 +26201,10 @@ class _ChildNodeListLazy extends ListBase<Node> implements NodeListWrapper {
   void fillRange(int start, int end, [Node fill]) {
     throw new UnsupportedError("Cannot fillRange on Node list");
   }
+
+  void removeRange(int start, int end) {
+    throw new UnsupportedError("Cannot removeRange on Node list");
+  }
   // -- end List<Node> mixins.
 
   // TODO(jacobr): benchmark whether this is more efficient or whether caching