Remove redundant 'flex' prefixes on enum values.

sky/sdk/lib/widgets/dialog.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 '../theme/colors.dart' as colors;
 import 'basic.dart';
 import 'default_text_style.dart';
 import 'material.dart';
 import "theme.dart";
 
@@ skipping 54 matching lines @@
       children.add(new Padding(
         padding: const EdgeDims(20.0, 24.0, 24.0, 24.0),
         child: new DefaultTextStyle(
           style: Theme.of(this).text.subhead,
           child: content
         )
       ));
     }
 
     if (actions != null)
-      children.add(new Flex(actions, justifyContent: FlexJustifyContent.flexEnd));
+      children.add(new Flex(actions, justifyContent: FlexJustifyContent.end));
 
     return new Stack([
       new Listener(
         child: mask,
         onGestureTap: (_) => onDismiss()
       ),
       new Center(
         child: new Container(
           margin: new EdgeDims.symmetric(horizontal: 40.0, vertical: 24.0),
           child: new ConstrainedBox(
             constraints: new BoxConstraints(minWidth: 280.0),
             child: new Material(
               level: 4,
               color: _color,
               child: new ShrinkWrapWidth(
                 child: new Block(children)
               )
             )
           )
         )
       )
     ]);
   }
 }