Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/HTMLOutputElement.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * 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.
  */
 
 #ifndef HTMLOutputElement_h
 #define HTMLOutputElement_h
 
 #include "core/html/DOMSettableTokenList.h"
 #include "core/html/HTMLFormControlElement.h"
-#include <wtf/OwnPtr.h>
 
 namespace WebCore {
 
 class HTMLOutputElement FINAL : public HTMLFormControlElement {
 public:
     static PassRefPtr<HTMLOutputElement> create(const QualifiedName&, Document*, HTMLFormElement*);
 
     virtual bool willValidate() const { return false; }
 
     String value() const;
@@ skipping 20 matching lines @@
 
     bool m_isDefaultValueMode;
     bool m_isSetTextContentInProgress;
     String m_defaultValue;
     RefPtr<DOMSettableTokenList> m_tokens;
 };
 
 } // namespace
 
 #endif