DevTools: Make sure ElementsTreeOutline is correctly rendered when element's hasChildren state chan…

LayoutTests/inspector/elements/undo-dom-edits-2.html

Index: LayoutTests/inspector/elements/undo-dom-edits-2.html
diff --git a/LayoutTests/inspector/elements/undo-dom-edits-2.html b/LayoutTests/inspector/elements/undo-dom-edits-2.html
index 40786c1b3380886fd9d9ea5c97b29484f29031ef..f794b0133abb8f6ae2a7d6cfa9a9694b0da30995 100644
--- a/LayoutTests/inspector/elements/undo-dom-edits-2.html
+++ b/LayoutTests/inspector/elements/undo-dom-edits-2.html
@@ -10,7 +10,13 @@ function test()
 
     function testSetUp(next)
     {
-        InspectorTest.expandElementsTree(next);
+        InspectorTest.addResult("Setting up");
+        InspectorTest.expandElementsTree(callback);
+
+        function callback()
+        {
+            InspectorTest.expandElementsTree(next);
+        }
     }
     testSuite.push(testSetUp);