Remove one more use of mirrors: Components now have to explicitly sync their fields.

sky/sdk/lib/framework/components2/ink_well.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 '../animation/animated_value.dart';
 import '../animation/curves.dart';
 import '../fn2.dart';
 import '../rendering/box.dart';
 import '../rendering/flex.dart';
 import '../rendering/object.dart';
@@ skipping 95 matching lines @@
     : super(child: child, key: key);
 
   RenderInkWell root;
 
   RenderInkWell createNode() => new RenderInkWell();
 }
 
 class InkWell extends Component {
   InkWell({ Object key, this.children }) : super(key: key);
 
-  List<UINode> children;
+  final List<UINode> children;
 
   UINode build() {
     return new InkWellWrapper(
       child: new FlexContainer(
         direction: FlexDirection.horizontal,
         justifyContent: FlexJustifyContent.center,
         children: children
       )
     );
   }
 }