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

Source/core/layout/line/InlineBox.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 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
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 22 matching lines @@
 class RootInlineBox;
 
 enum MarkLineBoxes { MarkLineBoxesDirty, DontMarkLineBoxes };
 
 // InlineBox represents a rectangle that occurs on a line.  It corresponds to
 // some LayoutObject (i.e., it represents a portion of that LayoutObject).
 class InlineBox {
     WTF_MAKE_NONCOPYABLE(InlineBox);
 public:
     InlineBox(LayoutObject& obj)
-        : m_next(0)
-        , m_prev(0)
-        , m_parent(0)
+        : m_next(nullptr)
+        , m_prev(nullptr)
+        , m_parent(nullptr)
         , m_layoutObject(obj)
         , m_logicalWidth()
 #if ENABLE(ASSERT)
         , m_hasBadParent(false)
 #endif
     {
     }
 
     InlineBox(LayoutObject& obj, LayoutPoint topLeft, LayoutUnit logicalWidth, bool firstLine, bool constructed,
         bool dirty, bool extracted, bool isHorizontal, InlineBox* next, InlineBox* prev, InlineFlowBox* parent)
@@ skipping 48 matching lines @@
 
     // InlineBoxes are allocated out of the rendering partition.
     void* operator new(size_t);
     void operator delete(void*);
 
 #ifndef NDEBUG
     void showTreeForThis() const;
     void showLineTreeForThis() const;
 
     virtual void showBox(int = 0) const;
-    virtual void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const LayoutObject* = 0, int = 0) const;
+    virtual void showLineTreeAndMark(const InlineBox* = nullptr, const char* = nullptr, const InlineBox* = nullptr, const char* = nullptr, const LayoutObject* = nullptr, int = 0) const;
 #endif
 
     virtual const char* boxName() const;
     virtual String debugName() const;
 
     bool isText() const { return m_bitfields.isText(); }
     void setIsText(bool isText) { m_bitfields.setIsText(isText); }
 
     virtual bool isInlineFlowBox() const { return false; }
     virtual bool isInlineTextBox() const { return false; }
@@ skipping 325 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::InlineBox*);
 void showLineTree(const blink::InlineBox*);
 #endif
 
 #endif // InlineBox_h