C++11: Replace 0 with nullptr where applicable in layout code.

Source/core/layout/LayoutTableSection.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 57 matching lines @@
 public:
     LayoutTableSection(Element*);
     virtual ~LayoutTableSection();
 
     LayoutTableRow* firstRow() const;
     LayoutTableRow* lastRow() const;
 
     const LayoutObjectChildList* children() const { return &m_children; }
     LayoutObjectChildList* children() { return &m_children; }
 
-    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = 0) override;
+    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = nullptr) override;
 
     virtual int firstLineBoxBaseline() const override;
 
     void addCell(LayoutTableCell*, LayoutTableRow*);
 
     int calcRowLogicalHeight();
     void layoutRows();
     void computeOverflowFromCells();
 
     LayoutTable* table() const { return toLayoutTable(parent()); }
@@ skipping 153 matching lines @@
     virtual const LayoutObjectChildList* virtualChildren() const override { return children(); }
 
     virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectTableSection || LayoutBox::isOfType(type); }
 
     virtual void willBeRemovedFromTree() override;
 
     virtual void layout() override;
 
     virtual void paintObject(const PaintInfo&, const LayoutPoint&) override;
 
-    virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
+    virtual void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
 
     int borderSpacingForRow(unsigned row) const { return m_grid[row].rowLayoutObject ? table()->vBorderSpacing() : 0; }
 
     void ensureRows(unsigned);
 
     bool rowHasOnlySpanningCells(unsigned);
     unsigned calcRowHeightHavingOnlySpanningCells(unsigned, int&, unsigned, unsigned&, Vector<int>&);
     void updateRowsHeightHavingOnlySpanningCells(LayoutTableCell*, struct SpanningRowsHeight&, unsigned&, Vector<int>&);
 
     void populateSpanningRowsHeightFromCell(LayoutTableCell*, struct SpanningRowsHeight&);
@@ skipping 51 matching lines @@
     // It is held at LayoutTableSection level to spare memory consumption by table cells.
     using CellsCollapsedBordersMap = HashMap<pair<const LayoutTableCell*, int>, CollapsedBorderValue>;
     CellsCollapsedBordersMap m_cellsCollapsedBorders;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableSection, isTableSection());
 
 } // namespace blink
 
 #endif // LayoutTableSection_h