Remove Attr child nodes (making Attr a Node, not a ContainerNode)

Source/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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef Attr_h
 #define Attr_h
 
-#include "core/dom/ContainerNode.h"
+#include "core/dom/Node.h"
 #include "core/dom/QualifiedName.h"
 
 namespace blink {
 
-// Attr can have Text children
-// therefore it has to be a fullblown Node. The plan
-// is to dynamically allocate a textchild and store the
-// resulting nodevalue in the attribute upon
-// destruction. however, this is not yet implemented.
-
-class Attr final : public ContainerNode {
+class Attr final : public Node {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<Attr> create(Element&, const QualifiedName&);
     static PassRefPtrWillBeRawPtr<Attr> create(Document&, const QualifiedName&, const AtomicString& value);
     virtual ~Attr();
 
     String name() const { return m_name.toString(); }
     bool specified() const { return true; }
     Element* ownerElement() const { return m_element; }
 
@@ skipping 13 matching lines @@
     const AtomicString& prefix() const { return m_name.prefix(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     Attr(Element&, const QualifiedName&);
     Attr(Document&, const QualifiedName&, const AtomicString& value);
 
     bool isElementNode() const = delete; // This will catch anyone doing an unnecessary check.
 
-    void createTextChild();
-
-    void setValueInternal(const AtomicString&);
-
     virtual String nodeName() const override { return name(); }
     virtual NodeType nodeType() const override { return ATTRIBUTE_NODE; }
 
     virtual String nodeValue() const override { return value(); }
     virtual void setNodeValue(const String&) override;
     virtual PassRefPtrWillBeRawPtr<Node> cloneNode(bool deep = true) override;
 
     virtual bool isAttributeNode() const override { return true; }
-    virtual bool childTypeAllowed(NodeType) const override;
-
-    virtual void childrenChanged(const ChildrenChange&) override;
-
-    void updateElementAttribute(const AtomicString&);
 
     // Attr wraps either an element/name, or a name/value pair (when it's a standalone Node.)
     // Note that m_name is always set, but m_element/m_standaloneValue may be null.
     RawPtrWillBeMember<Element> m_element;
     QualifiedName m_name;
     // Holds the value if it is a standalone Node, or the local name of the
     // attribute it is attached to on an Element. The latter may (letter case)
     // differ from m_name's local name. As these two modes are non-overlapping,
     // use a single field.
     AtomicString m_standaloneValueOrAttachedLocalName;
-    unsigned m_ignoreChildrenChanged;
 };
 
 DEFINE_NODE_TYPE_CASTS(Attr, isAttributeNode());
 
 } // namespace blink
 
 #endif // Attr_h