Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXTableCell.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 23 matching lines @@
 namespace blink {
 
 class AXObjectCacheImpl;
 
 class AXTableCell : public AXLayoutObject {
 
 protected:
     AXTableCell(LayoutObject*, AXObjectCacheImpl&);
 
 public:
-    static PassRefPtr<AXTableCell> create(LayoutObject*, AXObjectCacheImpl&);
+    static PassRefPtrWillBeRawPtr<AXTableCell> create(LayoutObject*, AXObjectCacheImpl&);
     virtual ~AXTableCell();
 
     virtual bool isTableCell() const override final;
 
     // fills in the start location and row span of cell
     virtual void rowIndexRange(pair<unsigned, unsigned>& rowRange);
     // fills in the start location and column span of cell
     virtual void columnIndexRange(pair<unsigned, unsigned>& columnRange);
     // In the case of cells that act as row or column headers.
     virtual SortDirection sortDirection() const override final;
@@ skipping 13 matching lines @@
     virtual AXObject* deprecatedTitleUIElement() const override final;
     virtual bool deprecatedExposesTitleUIElement() const override final { return true; }
     virtual bool computeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override final;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXTableCell, isTableCell());
 
 } // namespace blink
 
 #endif // AXTableCell_h