Make changing themes work again.

sky/sdk/lib/widgets/material.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/animation/animation_performance.dart';
 import 'package:sky/painting/box_painter.dart';
 import 'package:sky/widgets/animated_component.dart';
 import 'package:sky/widgets/animation_builder.dart';
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/default_text_style.dart';
@@ skipping 72 matching lines @@
           break;
         default:
           break;
       }
     }
     return color == null ? null : new AnimatedColor(color);
   }
 
   Widget build() {
     return _builder.build(
-        new DefaultTextStyle(style: Theme.of(this).text.body1, child: child)
+      new DefaultTextStyle(style: Theme.of(this).text.body1, child: child)
     );
   }
 
 }