Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXMenuListPopup.h

 /*
  * Copyright (C) 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "modules/accessibility/AXMockObject.h"
 
 namespace blink {
 
 class AXObjectCacheImpl;
 class AXMenuListOption;
 class HTMLElement;
 
 class AXMenuListPopup final : public AXMockObject {
 public:
-    static PassRefPtr<AXMenuListPopup> create(AXObjectCacheImpl& axObjectCache) { return adoptRef(new AXMenuListPopup(axObjectCache)); }
+    static PassRefPtrWillBeRawPtr<AXMenuListPopup> create(AXObjectCacheImpl& axObjectCache) { return adoptRefWillBeNoop(new AXMenuListPopup(axObjectCache)); }
 
     virtual bool isEnabled() const override;
     virtual bool isOffScreen() const override;
 
     void didUpdateActiveOption(int optionIndex);
     void didShow();
     void didHide();
     AXObject* activeChild();
 
 private:
@@ skipping 15 matching lines @@
 
     // Note that this may be -1 if nothing is selected.
     int m_activeIndex;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuListPopup, isMenuListPopup());
 
 } // namespace blink
 
 #endif // AXMenuListPopup_h