Remove redundant 'flex' prefixes on enum values.

sky/sdk/example/widgets/styled_text.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/painting/text_style.dart';
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/flex.dart';
 import 'package:sky/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets/basic.dart';
@@ skipping 78 matching lines @@
       if (line != lines.last) {
         children.add(createSeparator());
       }
     }
 
     Container body = new Container(
         padding: new EdgeDims.symmetric(horizontal: 8.0),
         child: new Flex(children,
           direction: FlexDirection.vertical,
           justifyContent: FlexJustifyContent.center,
-          alignItems: FlexAlignItems.flexStart
+          alignItems: FlexAlignItems.start
         )
       );
 
     Listener interactiveBody = new Listener(
       child: body,
       onPointerDown: toggleToTextFunction
     );
 
     return new Theme(
       data: new ThemeData.light(),
@@ skipping 10 matching lines @@
   }
 }
 
 void main() {
   runApp(new StyledTextApp());
   SkyBinding.instance.onFrame = () {
     // uncomment this for debugging:
     // SkyBinding.instance.debugDumpRenderTree();
   };
 }