Fix unscrollable scrollers after closing a <dialog>.

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1487 matching lines @@
       parent()->removeChild(this);
   }
 
   bool visibleToHitTestRequest(const HitTestRequest& request) const {
     return style()->visibility() == EVisibility::Visible &&
            (request.ignorePointerEventsNone() ||
             style()->pointerEvents() != PE_NONE) &&
            !isInert();
   }
 
+  // Warning: inertness can change without causing relayout.
   bool visibleToHitTesting() const {
-    return style()->visibility() == EVisibility::Visible &&
-           style()->pointerEvents() != PE_NONE && !isInert();
+    return style()->visibleToHitTesting() && !isInert();
   }
 
   // Map points and quads through elements, potentially via 3d transforms. You
   // should never need to call these directly; use localToAbsolute/
   // absoluteToLocal methods instead.
   virtual void mapLocalToAncestor(
       const LayoutBoxModelObject* ancestor,
       TransformState&,
       MapCoordinatesFlags = ApplyContainerFlip) const;
   // If the LayoutBoxModelObject ancestor is non-null, the input quad is in the
@@ skipping 1076 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h