Refactor: Clear m_axObjectCache when AXObject detaches

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 22 matching lines @@
 #include "core/html/HTMLMapElement.h"
 #include "modules/accessibility/AXMockObject.h"
 
 namespace blink {
 
 class AXObjectCacheImpl;
 
 class AXImageMapLink final : public AXMockObject {
 
 private:
-    explicit AXImageMapLink(AXObjectCacheImpl*);
+    explicit AXImageMapLink(AXObjectCacheImpl&);
 
 public:
-    static PassRefPtr<AXImageMapLink> create(AXObjectCacheImpl*);
+    static PassRefPtr<AXImageMapLink> create(AXObjectCacheImpl&);
     virtual ~AXImageMapLink();
 
     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(); }
 
@@ skipping 18 matching lines @@
     virtual void detachFromParent() override;
 
     virtual bool isImageMapLink() const override { return true; }
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXImageMapLink, isImageMapLink());
 
 } // namespace blink
 
 #endif // AXImageMapLink_h