Rename "BorderSide.None" to "BorderSide.none", since it's a constant, and change the sky.Size.infin…

sky/examples/game/lib/sprite_box.dart

Index: sky/examples/game/lib/sprite_box.dart
diff --git a/sky/examples/game/lib/sprite_box.dart b/sky/examples/game/lib/sprite_box.dart
index 8c8f66b57e6b18851b92d89ecb7c27e3d8d91c96..01c34f9f29f3b5aa867bb31972370b7369886b9e 100644
--- a/sky/examples/game/lib/sprite_box.dart
+++ b/sky/examples/game/lib/sprite_box.dart
@@ -38,7 +38,7 @@ class SpriteBox extends RenderBox {
   double get systemHeight => _systemHeight;
 
   void performLayout() {
-    size = constraints.constrain(new Size.infinite());
+    size = constraints.constrain(Size.infinite);
   }
 
   void handleEvent(Event event) {
@@ -136,4 +136,4 @@ class SpriteBox extends RenderBox {
     _rootNode.update(delta);
     _scheduleTick();
   }
-}
+}