Remove testRunner.display() from most compositing/ tests

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

Index: LayoutTests/compositing/iframes/overlapped-iframe-iframe.html
diff --git a/LayoutTests/compositing/iframes/overlapped-iframe-iframe.html b/LayoutTests/compositing/iframes/overlapped-iframe-iframe.html
index 810a3dce5dddec689954fb6a5aaa11803796d57d..e3794b435b39f4581ade687432c8f434b7895282 100644
--- a/LayoutTests/compositing/iframes/overlapped-iframe-iframe.html
+++ b/LayoutTests/compositing/iframes/overlapped-iframe-iframe.html
@@ -25,21 +25,14 @@
   </style>
   <script>
     if (window.testRunner) {
-        testRunner.waitUntilDone();
         testRunner.dumpAsText();
     }
 
     function doTest()
     {
-        // For some reason this delay is required for AppKit to not short-circuit the display which is required
-        // for overlap testing to kick in.
-        window.setTimeout(function() {
-            if (window.testRunner) {
-                testRunner.display();
-                document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
-                testRunner.notifyDone();
-            }
-        }, 0);
+        if (window.testRunner) {
+            document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
+        }
     }
 
     window.addEventListener('load', doTest, false);