Give ParentDataNodes snappier names

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 {
@@ skipping 10 matching lines @@
   final UINode center;
   final List<UINode> right;
   final Color backgroundColor;
 
   UINode build() {
     List<UINode> children = new List<UINode>();
     if (left != null)
       children.add(left);
 
     if (center != null) {
-      children.add(new FlexExpandingChild(
-        new Padding(child: center, padding: new EdgeDims.only(left: 24.0))));
+      children.add(
+        new Flexible(
+          child: new Padding(
+            child: center,
+            padding: new EdgeDims.only(left: 24.0)
+          )
+        )
+      );
     }
 
     if (right != null)
       children.addAll(right);
 
     return new Container(
       child: new Flex(
         [new Container(child: new Flex(children), height: kToolBarHeight)],
         alignItems: FlexAlignItems.flexEnd
       ),
       padding: new EdgeDims.symmetric(horizontal: 8.0),
       decoration: new BoxDecoration(
         backgroundColor: backgroundColor,
         boxShadow: shadows[2]
       )
     );
   }
 
 }