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

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 10065298c61c4bfa389c2ea3cf25a5930036fb8a..4f8b434ff4238cd21d3a21f026aad80b845141cd 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1746,9 +1746,10 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   }
 
   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();