Remove the old multicol implementation.

Source/core/layout/LayoutBlockFlow.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 270 matching lines @@
     FloatingObject* insertFloatingObject(LayoutBox&);
     void removeFloatingObject(LayoutBox*);
     void removeFloatingObjectsBelow(FloatingObject*, int logicalOffset);
 
     // Called from lineWidth, to position the floats added in the last line.
     // Returns true if and only if it has positioned any floats.
     bool positionNewFloats(LineWidth* = 0);
 
     LayoutUnit getClearDelta(LayoutBox* child, LayoutUnit yPos);
 
-    bool hasOverhangingFloats() { return parent() && !hasColumns() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); }
+    bool hasOverhangingFloats() { return parent() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); }
     bool hasOverhangingFloat(LayoutBox*);
     void addIntrudingFloats(LayoutBlockFlow* prev, LayoutUnit xoffset, LayoutUnit yoffset);
     void addOverhangingFloats(LayoutBlockFlow* child, bool makeChildPaintOtherFloats);
 
     LayoutUnit lowestFloatLogicalBottom(FloatingObject::Type = FloatingObject::FloatLeftRight) const;
     LayoutUnit nextFloatLogicalBottomBelow(LayoutUnit, ShapeOutsideFloatOffsetMode = ShapeOutsideFloatMarginBoxOffset) const;
 
     virtual bool hitTestFloats(HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override final;
 
     virtual void invalidatePaintForOverhangingFloats(bool paintAllDescendants) override final;
@@ skipping 22 matching lines @@
         PagedFlowThread
     };
 
     FlowThreadType flowThreadType(const ComputedStyle&);
 
     LayoutMultiColumnFlowThread* createMultiColumnFlowThread(FlowThreadType);
     void createOrDestroyMultiColumnFlowThreadIfNeeded(const ComputedStyle* oldStyle);
 
     void updateLogicalWidthForAlignment(const ETextAlign&, const RootInlineBox*, BidiRun* trailingSpaceRun, LayoutUnit& logicalLeft, LayoutUnit& totalLogicalWidth, LayoutUnit& availableLogicalWidth, unsigned expansionOpportunityCount);
     void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight);
-    bool shouldRelayoutForPagination(LayoutUnit& pageLogicalHeight, LayoutUnit layoutOverflowLogicalBottom) const;
-    void setColumnCountAndHeight(unsigned count, LayoutUnit pageLogicalHeight);
 
     bool shouldBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_lineBreakToAvoidWidow >= 0; }
     void clearShouldBreakAtLineToAvoidWidow() const;
     int lineBreakToAvoidWidow() const { return m_rareData ? m_rareData->m_lineBreakToAvoidWidow : -1; }
     void setBreakAtLineToAvoidWidow(int);
     void clearDidBreakAtLineToAvoidWidow();
     void setDidBreakAtLineToAvoidWidow();
     bool didBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_didBreakAtLineToAvoidWidow; }
 
 public:
@@ skipping 193 matching lines @@
 
 // END METHODS DEFINED IN LayoutBlockFlowLine
 
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlockFlow, isLayoutBlockFlow());
 
 } // namespace blink
 
 #endif // LayoutBlockFlow_h