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

Source/core/layout/LayoutTable.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, 2010 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 105 matching lines @@
     {
         if (style()->isHorizontalWritingMode())
             return style()->isFlippedBlocksWritingMode() ? outerBorderBefore() : outerBorderAfter();
         return style()->isLeftToRightDirection() ? outerBorderEnd() : outerBorderStart();
     }
 
     int calcBorderStart() const;
     int calcBorderEnd() const;
     void recalcBordersInRowDirection();
 
-    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = 0) override;
-    virtual void addChildIgnoringContinuation(LayoutObject* newChild, LayoutObject* beforeChild = 0) override;
+    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = nullptr) override;
+    virtual void addChildIgnoringContinuation(LayoutObject* newChild, LayoutObject* beforeChild = nullptr) override;
 
     struct ColumnStruct {
         explicit ColumnStruct(unsigned initialSpan = 1)
             : span(initialSpan)
         {
         }
 
         unsigned span;
     };
 
@@ skipping 68 matching lines @@
 
     LayoutUnit bordersPaddingAndSpacingInRowDirection() const
     {
         // 'border-spacing' only applies to separate borders (see 17.6.1 The separated borders model).
         return borderStart() + borderEnd() + (collapseBorders() ? LayoutUnit() : (paddingStart() + paddingEnd() + borderSpacingInRowDirection()));
     }
 
     // Return the first column or column-group.
     LayoutTableCol* firstColumn() const;
 
-    LayoutTableCol* colElement(unsigned col, bool* startEdge = 0, bool* endEdge = 0) const
+    LayoutTableCol* colElement(unsigned col, bool* startEdge = nullptr, bool* endEdge = nullptr) const
     {
         // The common case is to not have columns, make that case fast.
         if (!m_hasColElements)
-            return 0;
+            return nullptr;
         return slowColElement(col, startEdge, endEdge);
     }
 
     bool needsSectionRecalc() const { return m_needsSectionRecalc; }
     void setNeedsSectionRecalc()
     {
         if (documentBeingDestroyed())
             return;
         m_needsSectionRecalc = true;
         setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::TableChanged);
@@ skipping 135 matching lines @@
     if (m_firstBody)
         return m_firstBody;
     return m_foot;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTable, isTable());
 
 } // namespace blink
 
 #endif // LayoutTable_h