Remove unused includes from core/html .cpp files

Source/core/html/HTMLDataListElement.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Apple 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 14 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/HTMLDataListElement.h"
 
-#include "HTMLNames.h"
 #include "core/dom/IdTargetObserverRegistry.h"
 #include "core/page/UseCounter.h"
 
 namespace WebCore {
 
 inline HTMLDataListElement::HTMLDataListElement(const QualifiedName& tagName, Document* document)
     : HTMLElement(tagName, document)
 {
     ScriptWrappable::init(this);
 }
 
 PassRefPtr<HTMLDataListElement> HTMLDataListElement::create(const QualifiedName& tagName, Document* document)
 {
     UseCounter::count(document, UseCounter::DataListElement);
     return adoptRef(new HTMLDataListElement(tagName, document));
 }
 
 PassRefPtr<HTMLCollection> HTMLDataListElement::options()
 {
     return ensureCachedHTMLCollection(DataListOptions);
 }
 
 void HTMLDataListElement::optionElementChildrenChanged()
 {
     treeScope()->idTargetObserverRegistry().notifyObservers(getIdAttribute());
 }
 
 } // namespace WebCore