Clear scroll anchor on all parent scrollers from ScrollAnchor::clear

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 1728 matching lines @@
     MutableForPainting(const LayoutObject& layoutObject)
         : m_layoutObject(const_cast<LayoutObject&>(layoutObject)) {}
 
     LayoutObject& m_layoutObject;
   };
   MutableForPainting getMutableForPainting() const {
     return MutableForPainting(*this);
   }
 
   void setIsScrollAnchorObject() { m_bitfields.setIsScrollAnchorObject(true); }
-  // Clears the IsScrollAnchorObject bit, unless any ScrollAnchor still refers
-  // to us.
-  void maybeClearIsScrollAnchorObject();
+
+  // If unconditionally is true, you are responsible for ensuring that
+  // no ScrollAnchors reference this LayoutObject.
+  void clearIsScrollAnchorObject(bool unconditionally = false);
 
   bool scrollAnchorDisablingStyleChanged() {
     return m_bitfields.scrollAnchorDisablingStyleChanged();
   }
   void setScrollAnchorDisablingStyleChanged(bool changed) {
     m_bitfields.setScrollAnchorDisablingStyleChanged(changed);
   }
 
   void clearChildNeedsOverflowRecalcAfterStyleChange() {
     m_bitfields.setChildNeedsOverflowRecalcAfterStyleChange(false);
@@ skipping 834 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