LayoutListItem: shorten refs, use nullptr.

third_party/WebKit/Source/core/layout/LayoutListItem.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009 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.
  *
@@ skipping 18 matching lines @@
 
 class HTMLOListElement;
 class LayoutListMarker;
 
 class LayoutListItem final : public LayoutBlockFlow {
 public:
     explicit LayoutListItem(Element*);
 
     int value() const
     {
-        if (!m_isValueUpToDate) {
+        if (!m_isValueUpToDate)
             updateValueNow();
-        }
         return m_value;
     }
     void updateValue();
 
     bool hasExplicitValue() const { return m_hasExplicitValue; }
     int explicitValue() const { return m_explicitValue; }
     void setExplicitValue(int);
     void clearExplicitValue();
 
     void setNotInList(bool);
@@ skipping 44 matching lines @@
     bool m_hasExplicitValue : 1;
     mutable bool m_isValueUpToDate : 1;
     bool m_notInList : 1;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutListItem, isListItem());
 
 } // namespace blink
 
 #endif // LayoutListItem_h