Pared the FontWeight constants down to normal and bold.

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
 }
 
 class TextStyle {
   const TextStyle({
     this.color,
@@ skipping 88 matching lines @@
       result.add('${prefix}fontSize: $fontSize');
     if (fontWeight != null)
       result.add('${prefix}fontWeight: $fontWeight');
     if (textAlign != null)
       result.add('${prefix}textAlign: $textAlign');
     if (result.isEmpty)
       return '${prefix}<no style specified>';
     return result.join('\n');
   }
 }