Add clear() to Element.classList.

sky/engine/core/dom/DOMTokenList.h

 /*
  * Copyright (C) 2010 Google 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 44 matching lines @@
     unsigned length() const;
     const AtomicString item(unsigned index) const;
 
     bool contains(const AtomicString&, ExceptionState&) const;
     void add(const Vector<String>&, ExceptionState&);
     void add(const AtomicString&, ExceptionState&);
     void remove(const Vector<String>&, ExceptionState&);
     void remove(const AtomicString&, ExceptionState&);
     bool toggle(const AtomicString&, ExceptionState&);
     bool toggle(const AtomicString&, bool force, ExceptionState&);
+    void clear();
 
     const AtomicString& toString() const { return value(); }
 
     Element* element() { return m_element.get(); }
 
     const AtomicString& value() const;
     void setValue(const AtomicString& value);
 
 private:
     DOMTokenList(Element&);
@@ skipping 10 matching lines @@
     static AtomicString addTokens(const AtomicString&, const Vector<String>&);
     static AtomicString removeToken(const AtomicString&, const AtomicString&);
     static AtomicString removeTokens(const AtomicString&, const Vector<String>&);
 
     RawPtr<Element> m_element;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_DOM_DOMTOKENLIST_H_