Remove testRunner.display() from most compositing/ tests

LayoutTests/compositing/iframes/become-overlapped-iframe.html

Index: LayoutTests/compositing/iframes/become-overlapped-iframe.html
diff --git a/LayoutTests/compositing/iframes/become-overlapped-iframe.html b/LayoutTests/compositing/iframes/become-overlapped-iframe.html
index 4c00fdc39bd5f40faf203d37c151846454c1c439..7f678738fc11765bab75add97bb9c9f9db54d978 100644
--- a/LayoutTests/compositing/iframes/become-overlapped-iframe.html
+++ b/LayoutTests/compositing/iframes/become-overlapped-iframe.html
@@ -26,22 +26,15 @@
     }
   </style>
   <script type="text/javascript" charset="utf-8">
-    if (window.testRunner) {
+    if (window.testRunner)
         testRunner.dumpAsText();
-        testRunner.waitUntilDone();
-    }
 
     function doTest()
     {
-        // Need to wait for compositing layers to be updated.
-        window.setTimeout(function() {
-          document.getElementById('overlay').style.height = '150px';
-            if (window.testRunner) {
-                testRunner.display(); // Painting has to happen to detect overlap.
-                document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
-                testRunner.notifyDone();
-            }
-        }, 0);
+        document.getElementById('overlay').style.height = '150px';
+        if (window.internals) {
+            document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
+        }
     }
 
     window.addEventListener('load', doTest, false);