Revert "Don't force layout for mouse event hit tests"

LayoutTests/fast/events/window-events-bubble.html

Index: LayoutTests/fast/events/window-events-bubble.html
diff --git a/LayoutTests/fast/events/window-events-bubble.html b/LayoutTests/fast/events/window-events-bubble.html
index f97c5969c32b227c453cfc02840c29da91d42585..a60f4641191fe35e372477f53480f60370a2bda2 100644
--- a/LayoutTests/fast/events/window-events-bubble.html
+++ b/LayoutTests/fast/events/window-events-bubble.html
@@ -9,8 +9,6 @@ if (window.testRunner) {
 function test()
 {
     if (window.eventSender) {
-        // Mouse events only work after an initial layout
-        document.body.offsetLeft;
         eventSender.mouseMoveTo(52, 52);
         eventSender.mouseDown();
         eventSender.mouseUp();
@@ -40,4 +38,4 @@ function log(text) {
         
     <div id="result" style="position: absolute; top: 100; left: 50;"><br></div>
 </body>
-</html>
+</html>