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

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

Index: third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h
diff --git a/third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h b/third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h
index 0809fb983bf1d69f06e73af4bbcafceff336c78e..27437a568b7826383be865bf8c230ac741a27bc6 100644
--- a/third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h
+++ b/third_party/WebKit/Source/core/layout/api/LayoutBoxItem.h
@@ -82,6 +82,11 @@ public:
         toBox()->mapLocalToAncestor(ancestor, state, flags);
     }
 
+    FloatQuad absoluteContentQuad() const
+    {
+        return toBox()->absoluteContentQuad();
+    }
+
 private:
     LayoutBox* toBox()
     {