Minor style fixes to TaskDescription.

sky/sdk/lib/widgets/task_description.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/widget.dart';
-import 'package:sky/widgets/theme.dart';
-import 'package:sky/mojo/activity.dart' as activity;
+import '../mojo/activity.dart' as activity;
+import 'theme.dart';
+import 'widget.dart';
 
 class TaskDescription extends Component {
-  Widget child;
-  String label;
 
-  TaskDescription({this.label, this.child});
+  TaskDescription({ this.label, this.child });
+
+  final Widget child;
+  final String label;
 
   Widget build() {
     activity.updateTaskDescription(label, Theme.of(this).primaryColor);
     return child;
   }
+
 }