[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LayoutBoxItem_h
 #define LayoutBoxItem_h
 
 #include "core/layout/LayoutBox.h"
 #include "core/layout/api/LayoutBoxModel.h"
 #include "platform/scroll/ScrollTypes.h"
@@ skipping 64 matching lines @@
     LayoutSize contentBoxOffset() const
     {
         return toBox()->contentBoxOffset();
     }
 
     void mapLocalToAncestor(const LayoutBoxModelObject* ancestor, TransformState& state, MapCoordinatesFlags flags = ApplyContainerFlip) const
     {
         toBox()->mapLocalToAncestor(ancestor, state, flags);
     }
 
+    FloatQuad absoluteContentQuad() const
+    {
+        return toBox()->absoluteContentQuad();
+    }
+
 private:
     LayoutBox* toBox()
     {
         return toLayoutBox(layoutObject());
     }
 
     const LayoutBox* toBox() const
     {
         return toLayoutBox(layoutObject());
     }
 };
 
 } // namespace blink
 
 #endif // LayoutBoxItem_h