Remove the old multicol implementation.

Source/core/layout/LayoutState.h

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 #ifndef LayoutState_h
 #define LayoutState_h
 
-#include "core/layout/ColumnInfo.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class ForceHorriblySlowRectMapping;
 class LayoutBox;
 class LayoutFlowThread;
 class LayoutObject;
 class LayoutView;
 
 class LayoutState {
     WTF_MAKE_NONCOPYABLE(LayoutState);
 public:
     // Constructor for root LayoutState created by LayoutView
     LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, LayoutView&);
     // Constructor for sub-tree layout
     explicit LayoutState(LayoutObject& root);
 
-    LayoutState(LayoutBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = 0, bool pageHeightLogicalChanged = false, ColumnInfo* = 0, bool containingBlockLogicalWidthChanged = false);
+    LayoutState(LayoutBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = 0, bool pageHeightLogicalChanged = false, bool containingBlockLogicalWidthChanged = false);
 
     ~LayoutState();
 
     void clearPaginationInformation();
-    bool isPaginatingColumns() const { return m_columnInfo; }
     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(const LayoutBox&, const LayoutUnit& childLogicalOffset) const;
 
-    void addForcedColumnBreak(const LayoutBox&, const LayoutUnit& childLogicalOffset);
-
-    void setColumnInfo(ColumnInfo* columnInfo) { m_columnInfo = columnInfo; }
-
     const LayoutSize& layoutOffset() const { return m_layoutOffset; }
     const LayoutSize& pageOffset() const { return m_pageOffset; }
     LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
     bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
     bool containingBlockLogicalWidthChanged() const { return m_containingBlockLogicalWidthChanged; }
 
     LayoutState* next() const { return m_next; }
 
     bool needsBlockDirectionLocationSetBeforeLayout() const { return m_isPaginated && m_pageLogicalHeight; }
 
     LayoutFlowThread* flowThread() const { return m_flowThread; }
 
-    ColumnInfo* columnInfo() const { return m_columnInfo; }
-
     LayoutObject& layoutObject() const { return m_layoutObject; }
 
 private:
     friend class ForceHorriblySlowRectMapping;
 
-    // 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_flowThread. See https://bugs.webkit.org/show_bug.cgi?id=100173
     bool m_isPaginated : 1;
     // If our page height has changed, this will force all blocks to relayout.
     bool m_pageLogicalHeightChanged : 1;
     bool m_containingBlockLogicalWidthChanged : 1;
 
     LayoutFlowThread* m_flowThread;
 
-    // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
-    ColumnInfo* m_columnInfo;
     LayoutState* m_next;
 
     // x/y offset from container. Does not include relative positioning or scroll offsets.
     LayoutSize m_layoutOffset;
 
     // The current page height for the pagination model that encloses us.
     LayoutUnit m_pageLogicalHeight;
     // The offset of the start of the first page in the nearest enclosing pagination model.
     LayoutSize m_pageOffset;
 
     LayoutObject& m_layoutObject;
 };
 
 } // namespace blink
 
 #endif // LayoutState_h