Clarify comments for methods added in r178921

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
@@ skipping 49 matching lines @@
     virtual const AtomicString& localName() const OVERRIDE { return m_name.localName(); }
     virtual const AtomicString& namespaceURI() const OVERRIDE { return m_name.namespaceURI(); }
     const AtomicString& prefix() const { return m_name.prefix(); }
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     Attr(Element&, const QualifiedName&);
     Attr(Document&, const QualifiedName&, const AtomicString& value);
 
-    bool isElementNode() const WTF_DELETED_FUNCTION; // Hide to catch useless calls.
+    bool isElementNode() const WTF_DELETED_FUNCTION; // 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;
@@ skipping 16 matching lines @@
     // use a single field.
     AtomicString m_standaloneValueOrAttachedLocalName;
     unsigned m_ignoreChildrenChanged;
 };
 
 DEFINE_NODE_TYPE_CASTS(Attr, isAttributeNode());
 
 } // namespace blink
 
 #endif // Attr_h