Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXMenuList.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 17 matching lines @@
 
 #include "modules/accessibility/AXLayoutObject.h"
 
 namespace blink {
 
 class AXObjectCacheImpl;
 class LayoutMenuList;
 
 class AXMenuList final : public AXLayoutObject {
 public:
-    static PassRefPtr<AXMenuList> create(LayoutMenuList* layoutObject, AXObjectCacheImpl&);
+    static PassRefPtrWillBeRawPtr<AXMenuList> create(LayoutMenuList* layoutObject, AXObjectCacheImpl&);
 
     virtual bool isCollapsed() const override;
     virtual AccessibilityExpanded isExpanded() const override final;
     virtual bool press() const override;
     virtual void clearChildren() override;
 
     void didUpdateActiveOption(int optionIndex);
     void didShowPopup();
     void didHidePopup();
 
 private:
     AXMenuList(LayoutMenuList*, AXObjectCacheImpl&);
 
     virtual bool isMenuList() const override { return true; }
     virtual AccessibilityRole determineAccessibilityRole() override final;
     virtual bool canSetFocusAttribute() const override;
 
     virtual void addChildren() override;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuList, isMenuList());
 
 } // namespace blink
 
 #endif // AXMenuList_h