Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXLayoutObject.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 33 matching lines @@
 class IntPoint;
 class Node;
 class VisibleSelection;
 class Widget;
 
 class MODULES_EXPORT AXLayoutObject : public AXNodeObject {
 protected:
     AXLayoutObject(LayoutObject*, AXObjectCacheImpl&);
 
 public:
-    static PassRefPtr<AXLayoutObject> create(LayoutObject*, AXObjectCacheImpl&);
+    static PassRefPtrWillBeRawPtr<AXLayoutObject> create(LayoutObject*, AXObjectCacheImpl&);
     virtual ~AXLayoutObject();
 
     // Public, overridden from AXObject.
     virtual LayoutObject* layoutObject() const override final { return m_layoutObject; }
     virtual LayoutRect elementRect() const override;
 
     void setLayoutObject(LayoutObject*);
     LayoutBoxModelObject* layoutBoxModelObject() const;
     Document* topDocument() const;
     bool shouldNotifyActiveDescendant() const;
@@ skipping 162 matching lines @@
     LayoutRect computeElementRect() const;
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXLayoutObject, isAXLayoutObject());
 
 } // namespace blink
 
 #endif // AXLayoutObject_h