Morph the APIs for Node, ParentNode, and Element closer to the specs

sky/engine/core/dom/Element.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) 2003-2011, 2013, 2014 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 58 matching lines @@
     static PassRefPtr<Element> create(const QualifiedName&, Document*);
     virtual ~Element();
 
     bool hasAttribute(const QualifiedName&) const;
     const AtomicString& getAttribute(const QualifiedName&) const;
     Vector<RefPtr<Attr>> getAttributes();
     bool hasAttributes() const;
     bool hasAttribute(const AtomicString& name) const;
     const AtomicString& getAttribute(const AtomicString& name) const;
     void setAttribute(const AtomicString& name, const AtomicString& value, ExceptionState&);
+    void setAttribute(const AtomicString& name, ExceptionState& es) {
+        setAttribute(name, String(), es);
+    }
     void removeAttribute(const AtomicString& name);
     void removeAttribute(const QualifiedName&);
 
     // Passing nullAtom as the second parameter removes the attribute when calling either of these set methods.
     void setAttribute(const QualifiedName&, const AtomicString& value);
     void setSynchronizedLazyAttribute(const QualifiedName&, const AtomicString& value);
 
     // Typed getters and setters for language bindings.
     int getIntegralAttribute(const QualifiedName& attributeName) const;
     void setIntegralAttribute(const QualifiedName& attributeName, int value);
@@ skipping 472 matching lines @@
     static PassRefPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRef(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif  // SKY_ENGINE_CORE_DOM_ELEMENT_H_