Remove unused includes from various .cpp files in core/

Source/core/page/MouseEventWithHitTestResults.cpp

 /*
    Copyright (C) 2006 Apple Computer, Inc.
 
    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/page/MouseEventWithHitTestResults.h"
 
 #include "core/dom/Element.h"
-#include "core/dom/Node.h"
 
 // Would TargetedMouseEvent be a better name?
 
 namespace WebCore {
 
 MouseEventWithHitTestResults::MouseEventWithHitTestResults(const PlatformMouseEvent& event, const HitTestResult& hitTestResult)
     : m_event(event)
     , m_hitTestResult(hitTestResult)
 {
 }
 
 bool MouseEventWithHitTestResults::isOverLink() const
 {
     return m_hitTestResult.URLElement() && m_hitTestResult.URLElement()->isLink();
 }
 
 }