Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXImageMapLink.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 25 matching lines @@
 namespace blink {
 
 class AXObjectCacheImpl;
 
 class AXImageMapLink final : public AXMockObject {
 
 private:
     explicit AXImageMapLink(AXObjectCacheImpl&);
 
 public:
-    static PassRefPtr<AXImageMapLink> create(AXObjectCacheImpl&);
+    static PassRefPtrWillBeRawPtr<AXImageMapLink> create(AXObjectCacheImpl&);
     virtual ~AXImageMapLink();
+    DECLARE_VIRTUAL_TRACE();
 
     void setHTMLAreaElement(HTMLAreaElement* element) { m_areaElement = element; }
     HTMLAreaElement* areaElement() const { return m_areaElement.get(); }
 
     void setHTMLMapElement(HTMLMapElement* element) { m_mapElement = element; }
     HTMLMapElement* mapElement() const { return m_mapElement.get(); }
 
     virtual Node* node() const override { return m_areaElement.get(); }
 
     virtual AccessibilityRole roleValue() const override;
     virtual bool isEnabled() const override { return true; }
 
     virtual Element* anchorElement() const override;
     virtual Element* actionElement() const override;
     virtual KURL url() const override;
     virtual bool isLink() const override { return true; }
     virtual bool isLinked() const override { return true; }
     virtual String deprecatedTitle(TextUnderElementMode) const override;
     virtual String deprecatedAccessibilityDescription() const override;
     virtual AXObject* computeParent() const override;
 
     virtual LayoutRect elementRect() const override;
 
 private:
-    RefPtrWillBePersistent<HTMLAreaElement> m_areaElement;
-    RefPtrWillBePersistent<HTMLMapElement> m_mapElement;
+    RefPtrWillBeMember<HTMLAreaElement> m_areaElement;
+    RefPtrWillBeMember<HTMLMapElement> m_mapElement;
 
+    virtual void detach() override;
     virtual void detachFromParent() override;
 
     virtual bool isImageMapLink() const override { return true; }
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXImageMapLink, isImageMapLink());
 
 } // namespace blink
 
 #endif // AXImageMapLink_h