Fix a regression when position:static with absolute child changed to relative

Source/core/layout/LayoutObject.h

Index: Source/core/layout/LayoutObject.h
diff --git a/Source/core/layout/LayoutObject.h b/Source/core/layout/LayoutObject.h
index ab0bfad98ae4fd89d6335b20b725642f6d76f775..5e27a393b930a14a09569dd63d73720e5cf96f2e 100644
--- a/Source/core/layout/LayoutObject.h
+++ b/Source/core/layout/LayoutObject.h
@@ -622,6 +622,7 @@ public:
     // is true if the layoutObject returned is an ancestor of paintInvalidationContainer.
     LayoutObject* container(const LayoutBoxModelObject* paintInvalidationContainer = nullptr, bool* paintInvalidationContainerSkipped = nullptr) const;
     LayoutBlock* containerForFixedPosition(const LayoutBoxModelObject* paintInvalidationContainer = nullptr, bool* paintInvalidationContainerSkipped = nullptr) const;
+    LayoutBlock* containerForAbsolutePosition() const;
 
     virtual LayoutObject* hoverAncestor() const { return parent(); }