Implement _ChildNodeListLazy.removeRange as throwing UnsupportedError

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 02d69ff93afecbf06f357033781f38f294094729..556358e7908d9b72e48ea46ccb967f0053459339 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -29891,6 +29891,10 @@ 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