[Effen] remove the last traces of the 'display' property from the effen component library.

sky/tests/framework/basic.sky

Index: sky/tests/framework/basic.sky
diff --git a/sky/tests/framework/basic.sky b/sky/tests/framework/basic.sky
index efe8e0cff43e367f4070c06393402dd43a0e0549..9dc207c01aebef4373b40c0a69adf55b0b23cbcf 100644
--- a/sky/tests/framework/basic.sky
+++ b/sky/tests/framework/basic.sky
@@ -8,7 +8,9 @@ import 'dart:sky.internals' as internals;
 void main() {
   new TestApp();
   runAfterDisplay(() {
-    var result = serializeNode(document.lastChild.previousSibling) + serializeNode(document.lastChild);
+    document.firstChild.remove();
+    document.firstChild.remove();
+    var result = serializeNode(document);
     try {
       internals.notifyTestComplete(result);
     } catch (e) {