Remove redundant 'flex' prefixes on enum values.

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 'package:sky/widgets/theme.dart';
 
 import '../painting/text_style.dart';
 import '../rendering/flex.dart';
 import '../theme/shadows.dart';
 import '../theme/typography.dart' as typography;
@@ skipping 49 matching lines @@
     }
 
     if (right != null)
       children.addAll(right);
 
     return new Container(
       child: new IconTheme(
         data: new IconThemeData(color: iconThemeColor),
         child: new Flex(
           [new Container(child: new Flex(children), height: kToolBarHeight)],
-          alignItems: FlexAlignItems.flexEnd
+          alignItems: FlexAlignItems.end
         )
       ),
       padding: new EdgeDims.symmetric(horizontal: 8.0),
       decoration: new BoxDecoration(
         backgroundColor: toolbarColor,
         boxShadow: shadows[2]
       )
     );
   }
 
 }