*** DO NOT LAND *** Measure the size and complexity of the old multicol implementation.

Source/core/rendering/LayoutState.h

Index: Source/core/rendering/LayoutState.h
diff --git a/Source/core/rendering/LayoutState.h b/Source/core/rendering/LayoutState.h
index 16aa5b6ef363c02f98a280d75e0b25ee61d8235a..430a287eeee20968866710a3bb007f7aa2aabf17 100644
--- a/Source/core/rendering/LayoutState.h
+++ b/Source/core/rendering/LayoutState.h
@@ -26,7 +26,6 @@
 #ifndef LayoutState_h
 #define LayoutState_h
 
-#include "core/rendering/ColumnInfo.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
@@ -50,7 +49,6 @@ public:
         , m_layoutDeltaXSaturated(false)
         , m_layoutDeltaYSaturated(false)
 #endif
-        , m_columnInfo(0)
         , m_lineGrid(0)
         , m_next(0)
         , m_shapeInsideInfo(0)
@@ -61,23 +59,19 @@ public:
     {
     }
 
-    LayoutState(LayoutState*, RenderBox*, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged, ColumnInfo*);
+    LayoutState(LayoutState*, RenderBox*, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged);
     LayoutState(RenderObject*);
 
     // LayoutState is allocated out of the rendering partition.
     void* operator new(size_t);
     void operator delete(void*);
 
-    void clearPaginationInformation();
-    bool isPaginatingColumns() const { return m_columnInfo && m_columnInfo->paginationUnit() == ColumnInfo::Column; }
     bool isPaginated() const { return m_isPaginated; }
 
     // The page logical offset is the object's offset from the top of the page in the page progression
     // direction (so an x-offset in vertical text and a y-offset for horizontal text).
     LayoutUnit pageLogicalOffset(RenderBox*, LayoutUnit childLogicalOffset) const;
 
-    void addForcedColumnBreak(RenderBox*, LayoutUnit childLogicalOffset);
-
     LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
     bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
 
@@ -98,10 +92,8 @@ private:
     void propagateLineGridInfo(RenderBox*);
     void establishLineGrid(RenderBlockFlow*);
 
-    void computeLineGridPaginationOrigin(RenderBox*);
-
 public:
-    // Do not add anything apart from bitfields until after m_columnInfo. See https://bugs.webkit.org/show_bug.cgi?id=100173
+    // Do not add anything apart from bitfields until after m_lineGrid. See https://bugs.webkit.org/show_bug.cgi?id=100173
     bool m_clipped:1;
     bool m_isPaginated:1;
     // If our page height has changed, this will force all blocks to relayout.
@@ -110,8 +102,6 @@ public:
     bool m_layoutDeltaXSaturated:1;
     bool m_layoutDeltaYSaturated:1;
 #endif
-    // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
-    ColumnInfo* m_columnInfo;
     // The current line grid that we're snapping to and the offset of the start of the grid.
     RenderBlockFlow* m_lineGrid;
     LayoutState* m_next;