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

Source/core/html/ValidationMessage.cpp

 /*
  * Copyright (C) 2010, 2012 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.
  */
 
 #include "config.h"
 #include "core/html/ValidationMessage.h"
 
 #include "core/html/HTMLFormControlElement.h"
 #include "core/page/Page.h"
-#include "core/page/Settings.h"
 #include "core/page/ValidationMessageClient.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 ALWAYS_INLINE ValidationMessage::ValidationMessage(HTMLFormControlElement* element)
     : m_element(element)
 {
     ASSERT(m_element);
 }
@@ skipping 37 matching lines @@
 }
 
 bool ValidationMessage::isVisible() const
 {
     if (ValidationMessageClient* client = validationMessageClient())
         return client->isValidationMessageVisible(*m_element);
     return false;
 }
 
 } // namespace WebCore