Remove the old multicol implementation.

Source/core/layout/LayoutView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 50 matching lines @@
     virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutView || LayoutBlockFlow::isOfType(type); }
 
     virtual DeprecatedPaintLayerType layerTypeRequired() const override { return NormalDeprecatedPaintLayer; }
 
     virtual bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
 
     virtual void layout() override;
     virtual void updateLogicalWidth() override;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
 
-    virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const override;
-
     // Based on FrameView::layoutSize, but:
     // - checks for null FrameView
     // - returns 0x0 if using printing layout
     // - scrollbar exclusion is compatible with root layer scrolling
     IntSize layoutSize(IncludeScrollbarsInRect = ExcludeScrollbars) const;
 
     int viewHeight(IncludeScrollbarsInRect scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).height(); }
     int viewWidth(IncludeScrollbarsInRect scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).width(); }
 
     int viewLogicalWidth(IncludeScrollbarsInRect = ExcludeScrollbars) const;
@@ skipping 158 matching lines @@
             m_paintInvalidationState->m_cachedOffsetsEnabled = true;
     }
 private:
     const PaintInvalidationState* m_paintInvalidationState;
     bool m_didDisable;
 };
 
 } // namespace blink
 
 #endif // LayoutView_h