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

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

 /*
  * 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 60 matching lines @@
   invalidateColumnSets();
   // Clear the interval tree right away, instead of leaving it around with dead
   // objects. Not that anyone _should_ try to access the interval tree when the
   // column sets are marked as invalid, but this is actually possible if other
   // parts of the engine has bugs that cause us to not lay out everything that
   // was marked for layout, so that LayoutObject::assertLaidOut() (and a LOT
   // of other assertions) fails.
   m_multiColumnSetIntervalTree.clear();
 }
 
-void LayoutFlowThread::invalidateColumnSets() {
-  if (m_columnSetsInvalidated) {
-    ASSERT(selfNeedsLayout());
-    return;
-  }
-
-  setNeedsLayoutAndFullPaintInvalidation(
-      LayoutInvalidationReason::ColumnsChanged);
-
-  m_columnSetsInvalidated = true;
-}
-
 void LayoutFlowThread::validateColumnSets() {
   m_columnSetsInvalidated = false;
   // Called to get the maximum logical width for the columnSet.
   updateLogicalWidth();
   generateColumnSetIntervalTree();
 }
 
 bool LayoutFlowThread::mapToVisualRectInAncestorSpace(
     const LayoutBoxModelObject* ancestor,
     LayoutRect& rect,
@@ skipping 137 matching lines @@
 
 void LayoutFlowThread::MultiColumnSetSearchAdapter::collectIfNeeded(
     const MultiColumnSetInterval& interval) {
   if (m_result)
     return;
   if (interval.low() <= m_offset && interval.high() > m_offset)
     m_result = interval.data();
 }
 
 }  // namespace blink