Rename Container's desiredSize argument to width and height arguments.

sky/sdk/lib/framework/components2/floating_action_button.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 '../fn2.dart';
 import '../rendering/box.dart';
 import '../theme2/colors.dart';
 import 'dart:sky' as sky;
 import 'ink_well.dart';
 import 'material.dart';
@@ skipping 13 matching lines @@
     if (content != null)
       children.add(content);
 
     return new Material(
       content: new CustomPaint(
         callback: (sky.Canvas canvas) {
           const double radius = _kSize / 2.0;
           canvas.drawCircle(radius, radius, radius, new sky.Paint()..color = Red[500]);
         },
         child: new Container(
-          desiredSize: const sky.Size(_kSize, _kSize),
+          width: _kSize,
+          height: _kSize,
           child: new InkWell(children: children))),
       level: level);
   }
 }