Remove testRunner.display() from most compositing/ tests

LayoutTests/compositing/iframes/overlapped-iframe.html

Index: LayoutTests/compositing/iframes/overlapped-iframe.html
diff --git a/LayoutTests/compositing/iframes/overlapped-iframe.html b/LayoutTests/compositing/iframes/overlapped-iframe.html
index 870e3edb41a824bdab44bceb1deed8c345250cfa..8606b08e7a628f862a74a82598158801952a39f8 100644
--- a/LayoutTests/compositing/iframes/overlapped-iframe.html
+++ b/LayoutTests/compositing/iframes/overlapped-iframe.html
@@ -25,19 +25,13 @@
   <script type="text/javascript" charset="utf-8">
     if (window.testRunner) {
         testRunner.dumpAsText();
-        testRunner.waitUntilDone();
     }
 
     function doTest()
     {
-        // For some reason this delay is required for AppKit to not short-circuit the display.
-        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);