Expose _remove from fn2

sky/sdk/lib/framework/components2/scaffold.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../fn2.dart';
 import 'dart:sky' as sky;
 import '../rendering/box.dart';
 import '../rendering/object.dart';
 
 
@@ skipping 169 matching lines @@
   void insert(RenderObjectWrapper child, ScaffoldSlots slot) {
     root[slot] = child != null ? child.root : null;
   }
 
   void removeChild(UINode node) {
     assert(node != null);
     root.remove(node.root);
     super.removeChild(node);
   }
 
+  void remove() {
+    if (toolbar != null)
+      removeChild(toolbar);
+    if (body != null)
+      removeChild(body);
+    if (statusbar != null)
+      removeChild(statusbar);
+    if (drawer != null)
+      removeChild(drawer);
+    if (floatingActionButton != null)
+      removeChild(floatingActionButton);
+    super.remove();
+  }
+
   void syncRenderObject(UINode old) {
     super.syncRenderObject(old);
     syncChild(toolbar, old is Scaffold ? old.toolbar : null, ScaffoldSlots.toolbar);
     syncChild(body, old is Scaffold ? old.body : null, ScaffoldSlots.body);
     syncChild(statusbar, old is Scaffold ? old.statusbar : null, ScaffoldSlots.statusBar);
     syncChild(drawer, old is Scaffold ? old.drawer : null, ScaffoldSlots.drawer);
     syncChild(floatingActionButton, old is Scaffold ? old.floatingActionButton : null, ScaffoldSlots.floatingActionButton);
   }
 
 }