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

Source/core/rendering/RenderBlock.h

Index: Source/core/rendering/RenderBlock.h
diff --git a/Source/core/rendering/RenderBlock.h b/Source/core/rendering/RenderBlock.h
index 2d84e53d41cf65609ca516434cd1bcfe757992c7..b71c1f29151d54c39533286ae523bf07c97dd167 100644
--- a/Source/core/rendering/RenderBlock.h
+++ b/Source/core/rendering/RenderBlock.h
@@ -23,7 +23,6 @@
 #ifndef RenderBlock_h
 #define RenderBlock_h
 
-#include "core/rendering/ColumnInfo.h"
 #include "core/rendering/FloatingObjects.h"
 #include "core/rendering/GapRects.h"
 #include "core/rendering/RenderBox.h"
@@ -148,12 +147,6 @@ public:
 
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
 
-    // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
-    virtual LayoutUnit availableLogicalWidth() const OVERRIDE FINAL;
-
-    LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
-    void adjustStartEdgeForWritingModeIncludingColumns(LayoutRect&) const;
-
     LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
     LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
 
@@ -176,10 +169,6 @@ public:
     int heightForLineCount(int);
     void clearTruncation();
 
-    void adjustRectForColumns(LayoutRect&) const;
-    virtual void adjustForColumns(LayoutSize&, const LayoutPoint&) const OVERRIDE FINAL;
-    void adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const;
-
     void addContinuationWithOutline(RenderInline*);
     bool paintsContinuationOutline(RenderInline*);
 
@@ -192,23 +181,12 @@ public:
     using RenderBoxModelObject::setContinuation;
 
     static RenderBlock* createAnonymousWithParentRendererAndDisplay(const RenderObject*, EDisplay = BLOCK);
-    static RenderBlockFlow* createAnonymousColumnsWithParentRenderer(const RenderObject*);
-    static RenderBlockFlow* createAnonymousColumnSpanWithParentRenderer(const RenderObject*);
     RenderBlock* createAnonymousBlock(EDisplay display = BLOCK) const { return createAnonymousWithParentRendererAndDisplay(this, display); }
-    RenderBlockFlow* createAnonymousColumnsBlock() const { return createAnonymousColumnsWithParentRenderer(this); }
-    RenderBlockFlow* createAnonymousColumnSpanBlock() const { return createAnonymousColumnSpanWithParentRenderer(this); }
 
     virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const OVERRIDE;
 
-    ColumnInfo* columnInfo() const;
     int columnGap() const;
 
-    void updateColumnInfoFromStyle(RenderStyle*);
-
-    // These two functions take the ColumnInfo* to avoid repeated lookups of the info in the global HashMap.
-    unsigned columnCount(ColumnInfo*) const;
-    LayoutRect columnRectAt(ColumnInfo*, unsigned) const;
-
     LayoutUnit paginationStrut() const { return m_rareData ? m_rareData->m_paginationStrut : LayoutUnit(); }
     void setPaginationStrut(LayoutUnit);
 
@@ -371,8 +349,6 @@ protected:
     bool simplifiedLayout();
     virtual void simplifiedNormalFlowLayout();
 
-    void setDesiredColumnCountAndWidth(int, LayoutUnit);
-
 public:
     virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
 protected:
@@ -416,7 +392,6 @@ private:
 
     void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild);
     virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild) OVERRIDE;
-    void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild);
 
     void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0);
 
@@ -436,17 +411,12 @@ private:
     // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
     virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool) { }
     void paintContents(PaintInfo&, const LayoutPoint&);
-    void paintColumnContents(PaintInfo&, const LayoutPoint&, bool paintFloats = false);
-    void paintColumnRules(PaintInfo&, const LayoutPoint&);
     void paintSelection(PaintInfo&, const LayoutPoint&);
     void paintCaret(PaintInfo&, const LayoutPoint&, CaretType);
 
     bool hasCaret() const { return hasCaret(CursorCaret) || hasCaret(DragCaret); }
     bool hasCaret(CaretType) const;
 
-    virtual bool avoidsFloats() const OVERRIDE;
-
-    bool hitTestColumns(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
     bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
     // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
     virtual bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&) { return false; }
@@ -489,14 +459,10 @@ private:
     virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE;
     virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE;
 
-    LayoutUnit desiredColumnWidth() const;
-
     void paintContinuationOutlines(PaintInfo&, const LayoutPoint&);
 
     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE FINAL;
 
-    void adjustPointToColumnContents(LayoutPoint&) const;
-
     void fitBorderToLinesIfNeeded(); // Shrink the box in which the border paints if border-fit is set.
     virtual void adjustForBorderFit(LayoutUnit x, LayoutUnit& left, LayoutUnit& right) const; // Helper function for borderFitAdjust
 
@@ -505,19 +471,10 @@ private:
     Position positionForBox(InlineBox*, bool start = true) const;
     PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
 
-    virtual void calcColumnWidth();
-    void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlockFlow* newBlockBox, RenderObject* newChild);
-
     bool expandsToEncloseOverhangingFloats() const;
 
-    void splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock, RenderBlock* middleBlock,
-                     RenderObject* beforeChild, RenderBoxModelObject* oldCont);
-    void splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox,
-                   RenderObject* newChild, RenderBoxModelObject* oldCont);
     RenderBlock* clone() const;
     RenderBlock* continuationBefore(RenderObject* beforeChild);
-    RenderBlockFlow* containingColumnsBlock(bool allowAnonymousColumnBlock = true);
-    RenderBlockFlow* columnsBlockForSpanningElement(RenderObject* newChild);
 
     // End helper functions and structs used by layoutBlockChildren.
 
@@ -536,8 +493,6 @@ protected:
     LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
     bool hasNextPage(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
 
-    virtual ColumnInfo::PaginationUnit paginationUnit() const;
-
 public:
     LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const;
     LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;