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

Source/core/rendering/RenderBlockFlow.h

Index: Source/core/rendering/RenderBlockFlow.h
diff --git a/Source/core/rendering/RenderBlockFlow.h b/Source/core/rendering/RenderBlockFlow.h
index 3135a04dcd9ddd15d58bc80bb409a16001360ec4..f2a405127278571b4e3814b2b45b5b45b83898cf 100644
--- a/Source/core/rendering/RenderBlockFlow.h
+++ b/Source/core/rendering/RenderBlockFlow.h
@@ -256,7 +256,7 @@ protected:
     virtual void insertedIntoTree() OVERRIDE;
     virtual void willBeDestroyed() OVERRIDE;
 private:
-    void layoutBlockFlow(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0);
+    void layoutBlockFlow(bool relayoutChildren);
     void layoutBlockChildren(bool relayoutChildren, LayoutUnit& maxFloatLogicalBottom, SubtreeLayoutScope&, LayoutUnit beforeEdge, LayoutUnit afterEdge);
 
     void layoutBlockChild(RenderBox* child, MarginInfo&, LayoutUnit& previousFloatLogicalBottom, LayoutUnit& maxFloatLogicalBottom);
@@ -293,7 +293,7 @@ private:
 
     LayoutUnit getClearDelta(RenderBox* child, LayoutUnit yPos);
 
-    bool hasOverhangingFloats() { return parent() && !hasColumns() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); }
+    bool hasOverhangingFloats() { return parent() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); }
     bool hasOverhangingFloat(RenderBox*);
     void addIntrudingFloats(RenderBlockFlow* prev, LayoutUnit xoffset, LayoutUnit yoffset);
     LayoutUnit addOverhangingFloats(RenderBlockFlow* child, bool makeChildPaintOtherFloats);
@@ -323,7 +323,7 @@ private:
     virtual RootInlineBox* createRootInlineBox(); // Subclassed by SVG
 
     void updateLogicalWidthForAlignment(const ETextAlign&, const RootInlineBox*, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float& availableLogicalWidth, int expansionOpportunityCount);
-    virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer&);
+    virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer&) { return false; }
 public:
     struct FloatWithRect {
         FloatWithRect(RenderBox* f)