Remove RenderSizedBox.

sky/sdk/lib/rendering/object.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:math' as math;
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Size, Rect, Color, Paint, Path;
 
 import '../app/scheduler.dart' as scheduler;
 import '../framework/node.dart';
@@ skipping 232 matching lines @@
       }
       header += ' relayoutSubtreeRoot=up$count';
     }
     if (_needsLayout)
       header += ' NEEDS-LAYOUT';
     if (!attached)
       header += ' DETACHED';
     prefix += '  ';
     return '${header}\n${debugDescribeSettings(prefix)}${debugDescribeChildren(prefix)}';
   }
-  String debugDescribeSettings(String prefix) => '${prefix}parentData: ${parentData}\n';
+  String debugDescribeSettings(String prefix) => '${prefix}parentData: ${parentData}\n${prefix}constraints: ${constraints}\n';
   String debugDescribeChildren(String prefix) => '';
 
 }
 
 class HitTestEntry {
   const HitTestEntry(this.target);
 
   final RenderObject target;
 }
 
@@ skipping 193 matching lines @@
     int count = 1;
     ChildType child = _firstChild;
     while (child != null) {
       result += '${prefix}child ${count}: ${child.toString(prefix)}';
       count += 1;
       child = child.parentData.nextSibling;
     }
     return result;
   }
 }