invalidateColumnSets() doesn't need to mark anything for layout.

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

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 91 matching lines @@
   virtual void addColumnSetToThread(LayoutMultiColumnSet*) = 0;
   virtual void removeColumnSetFromThread(LayoutMultiColumnSet*);
 
   void computeLogicalHeight(LayoutUnit logicalHeight,
                             LayoutUnit logicalTop,
                             LogicalExtentComputedValues&) const override;
 
   bool hasColumnSets() const { return m_multiColumnSetList.size(); }
 
   void validateColumnSets();
-  void invalidateColumnSets();
+  void invalidateColumnSets() { m_columnSetsInvalidated = true; }
   bool hasValidColumnSetInfo() const {
     return !m_columnSetsInvalidated && !m_multiColumnSetList.isEmpty();
   }
 
   bool mapToVisualRectInAncestorSpace(
       const LayoutBoxModelObject* ancestor,
       LayoutRect&,
       VisualRectFlags = DefaultVisualRectFlags) const override;
 
   LayoutUnit pageLogicalHeightForOffset(LayoutUnit);
@@ skipping 79 matching lines @@
 struct ValueToString<LayoutMultiColumnSet*> {
   static String toString(const LayoutMultiColumnSet* value) {
     return String::format("%p", value);
   }
 };
 #endif
 
 }  // namespace blink
 
 #endif  // LayoutFlowThread_h