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 cd1f5dd56c8a842281ac153310b44783d3cdb3ec..b2cb8c65846274629bbe3557c647bc3d3e8e2b45 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1660,9 +1660,14 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     return MutableForPainting(*this);
   }
 
-  void setIsScrollAnchorObject() { m_bitfields.setIsScrollAnchorObject(true); }
+  void setIsScrollAnchorObject(bool value) {
+    m_bitfields.setIsScrollAnchorObject(value);
+  }
   // Clears the IsScrollAnchorObject bit, unless any ScrollAnchor still refers to us.
   void maybeClearIsScrollAnchorObject();
+  // Clears the scroll anchor on all scrollableAreas that are in the ancestor
+  // chain of this LayoutObject.
+  void clearScrollAnchors();
 
   bool scrollAnchorDisablingStyleChanged() {
     return m_bitfields.scrollAnchorDisablingStyleChanged();