Fix all the components to pick the right colours from the theme.

sky/sdk/lib/painting/text_style.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 'dart:sky';
 
 enum FontWeight { w100, w200, w300, w400, w500, w600, w700, w800, w900 }
-const thin = FontWeight.w100;
-const extraLight = FontWeight.w200;
-const light = FontWeight.w300;
 const normal = FontWeight.w400;
-const medium = FontWeight.w500;
-const semiBold = FontWeight.w600;
 const bold = FontWeight.w700;
-const extraBold = FontWeight.w800;
-const black = FontWeight.w900;
 
 enum TextAlign { left, right, center }
 
 enum TextDecoration { none, underline, overline, lineThrough }
 const underline = const <TextDecoration>[TextDecoration.underline];
 const overline = const <TextDecoration>[TextDecoration.overline];
 const lineThrough = const <TextDecoration>[TextDecoration.lineThrough];
 
 enum TextDecorationStyle { solid, double, dotted, dashed, wavy }
 
@@ skipping 177 matching lines @@
       result.add('${prefix}decoration: $decoration');
     if (decorationColor != null)
       result.add('${prefix}decorationColor: $decorationColor');
     if (decorationStyle != null)
       result.add('${prefix}decorationStyle: $decorationStyle');
     if (result.isEmpty)
       return '${prefix}<no style specified>';
     return result.join('\n');
   }
 }