Rename UINode to Widget.

sky/sdk/lib/widgets/tool_bar.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 '../rendering/flex.dart';
 import '../theme2/shadows.dart';
 import '../theme2/view_configuration.dart';
 import 'basic.dart';
 
 class ToolBar extends Component {
 
   ToolBar({
     String key,
     this.left,
     this.center,
     this.right,
     this.backgroundColor
   }) : super(key: key);
 
-  final UINode left;
-  final UINode center;
-  final List<UINode> right;
+  final Widget left;
+  final Widget center;
+  final List<Widget> right;
   final Color backgroundColor;
 
-  UINode build() {
-    List<UINode> children = new List<UINode>();
+  Widget build() {
+    List<Widget> children = new List<Widget>();
     if (left != null)
       children.add(left);
 
     if (center != null) {
       children.add(
         new Flexible(
           child: new Padding(
             child: center,
             padding: new EdgeDims.only(left: 24.0)
           )
@@ skipping 11 matching lines @@
       ),
       padding: new EdgeDims.symmetric(horizontal: 8.0),
       decoration: new BoxDecoration(
         backgroundColor: backgroundColor,
         boxShadow: shadows[2]
       )
     );
   }
 
 }