Fallback to root layer if hit-testing does not hit anything in iframe

LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html

Index: LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html
diff --git a/LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html b/LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html
index 9f4b6ee719aa9207fce3318752e89f219a75f896..8ac3fd28515ca565a46eb3cffeabfa2fb4240b7c 100644
--- a/LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html
+++ b/LayoutTests/fast/events/dispatch-mouse-events-to-window-always.html
@@ -63,8 +63,6 @@ onload = function() {
     generateEventsAndVerify(10, 10, [document.body, document, window]);
     debug('outside body, outside element, inside frame'); // received by doc, window
     generateEventsAndVerify(10, 500, [document, window]);
-    debug('outside body, outside element, outside frame'); // received by doc, window
-    generateEventsAndVerify(10, 2000, [document, window]);
 
     finishJSTest();
 
@@ -98,4 +96,4 @@ function objectsToString(objects) {
     return String(objects.map(function(o) {return o.constructor.name;}));
 }
 
-</script>
+</script>