Remove unused includes from core/html .cpp files

Source/core/html/HTMLSummaryElement.cpp

 /*
  * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLSummaryElement.h"
 
 #include "HTMLNames.h"
 #include "core/dom/KeyboardEvent.h"
-#include "core/dom/MouseEvent.h"
 #include "core/dom/NodeRenderingContext.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLDetailsElement.h"
 #include "core/html/shadow/DetailsMarkerControl.h"
 #include "core/html/shadow/HTMLContentElement.h"
-#include "core/platform/PlatformMouseEvent.h"
 #include "core/rendering/RenderBlock.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 PassRefPtr<HTMLSummaryElement> HTMLSummaryElement::create(const QualifiedName& tagName, Document* document)
 {
     RefPtr<HTMLSummaryElement> summary = adoptRef(new HTMLSummaryElement(tagName, document));
     summary->ensureUserAgentShadowRoot();
@@ skipping 98 matching lines @@
 
 bool HTMLSummaryElement::willRespondToMouseClickEvents()
 {
     if (isMainSummary() && renderer())
         return true;
 
     return HTMLElement::willRespondToMouseClickEvents();
 }
 
 }