Remove display() from more layout tests

LayoutTests/fast/frames/transparent-scrollbar.html

Index: LayoutTests/fast/frames/transparent-scrollbar.html
diff --git a/LayoutTests/fast/frames/transparent-scrollbar.html b/LayoutTests/fast/frames/transparent-scrollbar.html
index 51a3d21e0d7a1f97b8b5552b36a238389eca02e0..28bf481f627ef98837b6cbe41e6c03e44ddb3612 100644
--- a/LayoutTests/fast/frames/transparent-scrollbar.html
+++ b/LayoutTests/fast/frames/transparent-scrollbar.html
@@ -17,22 +17,20 @@ body {
 }
 
 </style>
+<script src="../../resources/run-after-display.js"></script>
 <script>
 function test()
 {
     if (window.testRunner) {
         testRunner.waitUntilDone();
         testRunner.dumpAsTextWithPixelResults();
-        testRunner.display();
     }
-
-    window.setTimeout(function() {
+    runAfterDisplay(function() {
         document.body.scrollTop = 2000;
         if (window.testRunner) {
-            testRunner.display();
             testRunner.notifyDone();
         }
-    }, 0);
+    });
 }
 </script>
 </head>