Remove compiler feature detection for = delete

sky/engine/core/dom/Attr.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 34 matching lines @@
     void detachFromElement();
 
     // FIXME(sky): Remove this.
     virtual const AtomicString& localName() const override { return m_name.localName(); }
 
     virtual void trace(Visitor*) override;
 
 private:
     Attr(Element&, const QualifiedName&);
 
-    bool isElementNode() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+    bool isElementNode() const = delete; // This will catch anyone doing an unnecessary check.
 
     virtual String nodeName() const override { return name(); }
     virtual NodeType nodeType() const override { return ATTRIBUTE_NODE; }
 
     virtual PassRefPtrWillBeRawPtr<Node> cloneNode(bool deep = true) override { return nullptr; }
 
     virtual bool isAttributeNode() const override { return true; }
 
     RawPtrWillBeMember<Element> m_element;
     QualifiedName m_name;
 };
 
 DEFINE_NODE_TYPE_CASTS(Attr, isAttributeNode());
 
 } // namespace blink
 
 #endif // Attr_h