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

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index efb3a7b8b57bf92a1a528dc7558baf3732306cd1..82b7316e602ac7b871a92e3febe4ca91dbd5a27d 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2800,13 +2800,7 @@ MouseEventWithHitTestResults Document::prepareMouseEvent(const HitTestRequest& r
 {
     ASSERT(!renderer() || renderer()->isRenderView());
 
-    // RenderView::hitTest causes a layout, and we don't want to hit that until the first
-    // layout because until then, there is nothing shown on the screen - the user can't
-    // have intentionally clicked on something belonging to this page. Furthermore,
-    // mousemove events before the first layout should not lead to a premature layout()
-    // happening, which could show a flash of white.
-    // See also the similar code in EventHandler::hitTestResultAtPoint.
-    if (!renderer() || !view() || !view()->didFirstLayout())
+    if (!renderer())
         return MouseEventWithHitTestResults(event, HitTestResult(LayoutPoint()));
 
     HitTestResult result(documentPoint);