[Effen] put Node class above its superclasses

sky/framework/fn.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.
 
 library fn;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'reflect.dart' as reflect;
@@ skipping 34 matching lines @@
       sky.Element styleNode = sky.document.createElement('style');
       styleNode.setChild(new sky.Text(".$className { $styles }"));
       sky.document.appendChild(styleNode);
       return new Style._internal(className);
     });
   }
 
   Style._internal(this._className);
 }
 
-abstract class ContentNode extends Node {
-  Node content;
-
-  ContentNode(Node content) : this.content = content, super(key: content._key);
-
-  void _sync(Node old, sky.ParentNode host, sky.Node insertBefore) {
-    Node oldContent = old == null ? null : (old as ContentNode).content;
-    content = _syncChild(content, oldContent, host, insertBefore);
-    _root = content._root;
-  }
-
-  void _remove() {
-    _removeChild(content);
-    super._remove();
-  }
-}
-
-class StyleNode extends ContentNode {
-  final Style style;
-
-  StyleNode(Node content, this.style): super(content);
-}
-
 void _parentInsertBefore(sky.ParentNode parent,
                          sky.Node node,
                          sky.Node ref) {
   if (ref != null) {
     ref.insertBefore([node]);
   } else {
     parent.appendChild(node);
   }
 }
 
@@ skipping 99 matching lines @@
     }
     node._sync(oldNode, host, insertBefore);
     if (oldNode != null)
       oldNode._defunct = true;
 
     assert(node._root is sky.Node);
     return node;
   }
 }
 
+abstract class ContentNode extends Node {
+  Node content;
+
+  ContentNode(Node content) : this.content = content, super(key: content._key);
+
+  void _sync(Node old, sky.ParentNode host, sky.Node insertBefore) {
+    Node oldContent = old == null ? null : (old as ContentNode).content;
+    content = _syncChild(content, oldContent, host, insertBefore);
+    _root = content._root;
+  }
+
+  void _remove() {
+    _removeChild(content);
+    super._remove();
+  }
+}
+
+class StyleNode extends ContentNode {
+  final Style style;
+
+  StyleNode(Node content, this.style): super(content);
+}
+
 /*
  * RenderNodes correspond to a desired state of a sky.Node. They are fully
  * immutable, with one exception: A Node which is a Component which lives within
  * an Element's children list, may be replaced with the "old" instance if it
  * has become stateful.
  */
 abstract class RenderNode extends Node {
 
   static final Map<sky.Node, RenderNode> _nodeMap =
       new HashMap<sky.Node, RenderNode>();
@@ skipping 687 matching lines @@
 
 abstract class App extends Component {
   sky.Node _host;
 
   App() : super(stateful: true) {
     _host = sky.document.createElement('div');
     sky.document.appendChild(_host);
     _scheduleComponentForRender(this);
   }
 }