Minor formatting fixes

packages/flutter/example/game/lib/sprite_box.dart

@@ -29,8 +29,7 @@ class SpriteBox extends RenderBox {
   NodeWithSize _rootNode;
 
   void set rootNode (NodeWithSize value) {
-    if (value == _rootNode)
-      return;
+    if (value == _rootNode) return;
 
     // Remove sprite box references
     if (_rootNode != null) _removeSpriteBoxReference(_rootNode);
@@ -110,11 +109,6 @@ class SpriteBox extends RenderBox {
     _scheduleTick();
   }
 
-  void detach() {
-    super.detach();
-
-  }
-
   // Properties
 
   /// The root node of the node tree that is rendered by this box.

packages/flutter/example/game/main.dart

@@ -93,7 +93,7 @@ class GameDemoApp extends App {
     return new Center(
       child: new RaisedButton(
         child: new Text("Play"),
-        onPressed:() => navigator.pushNamed('/game')
+        onPressed: () => navigator.pushNamed('/game')
       )
     );
   }