Unify and provide one IsGarbageCollectedType<T> implementation.

third_party/WebKit/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 114 matching lines @@
     struct CellStruct {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     public:
         // All the cells that fills this grid "slot".
         // Due to colspan / rowpsan, it is possible to have overlapping cells
         // (see class comment about an example).
         // This Vector is sorted in DOM order.
         Vector<LayoutTableCell*, 1> cells;
         bool inColSpan; // true for columns after the first in a colspan
 
-        CellStruct()
-            : inColSpan(false)
-        {
-        }
+        CellStruct();
+        ~CellStruct();
 
         // This is the cell in the grid "slot" that is on top of the others
         // (aka the last cell in DOM order for this slot).
         //
         // This is the cell originating from this slot if it exists.
         //
         // The concept of a primary cell is dubious at most as it doesn't
         // correspond to a DOM or rendering concept. Also callers should be
         // careful about assumptions about it. For example, even though the
         // primary cell is visibly the top most, it is not guaranteed to be
@@ skipping 243 matching lines @@
     // The use is to disable a painting optimization where we just paint the
     // invalidated cells.
     bool m_hasMultipleCellLevels;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableSection, isTableSection());
 
 } // namespace blink
 
 #endif // LayoutTableSection_h