Remove unused includes from core/html .cpp files

Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 10 matching lines @@
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLTextAreaElement.h"
 
 #include "CSSValueKeywords.h"
 #include "HTMLNames.h"
-#include "core/dom/Attribute.h"
 #include "core/dom/BeforeTextInsertedEvent.h"
 #include "core/dom/Document.h"
 #include "core/dom/Event.h"
 #include "core/dom/EventNames.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExceptionCodePlaceholder.h"
 #include "core/dom/Text.h"
-#include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
-#include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/TextIterator.h"
 #include "core/html/FormController.h"
 #include "core/html/FormDataList.h"
 #include "core/html/shadow/TextControlInnerElements.h"
-#include "core/page/EventHandler.h"
 #include "core/page/Frame.h"
 #include "core/platform/LocalizedStrings.h"
 #include "core/rendering/RenderTextControlMultiLine.h"
 #include <wtf/StdLibExtras.h>
 #include <wtf/text/StringBuilder.h>
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
@@ skipping 495 matching lines @@
         RefPtr<HTMLDivElement> placeholder = HTMLDivElement::create(document());
         m_placeholder = placeholder.get();
         m_placeholder->setPseudo(AtomicString("-webkit-input-placeholder", AtomicString::ConstructFromLiteral));
         userAgentShadowRoot()->insertBefore(m_placeholder, innerTextElement()->nextSibling(), ASSERT_NO_EXCEPTION);
     }
     m_placeholder->setInnerText(placeholderText, ASSERT_NO_EXCEPTION);
     fixPlaceholderRenderer(m_placeholder, innerTextElement());
 }
 
 }