Remove duplicated headers from core/

Source/core/svg/graphics/filters/SVGFilterBuilder.cpp

 /*
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  *
  * 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/svg/graphics/filters/SVGFilterBuilder.h"
 
-#include "core/platform/graphics/filters/FilterEffect.h"
 #include "core/platform/graphics/filters/SourceAlpha.h"
 #include "core/platform/graphics/filters/SourceGraphic.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 SVGFilterBuilder::SVGFilterBuilder(PassRefPtr<FilterEffect> sourceGraphic, PassRefPtr<FilterEffect> sourceAlpha)
 {
     m_builtinEffects.add(SourceGraphic::effectName(), sourceGraphic);
     m_builtinEffects.add(SourceAlpha::effectName(), sourceAlpha);
     addBuiltinEffects();
 }
 
@@ skipping 59 matching lines @@
 
     effect->clearResult();
 
     HashSet<FilterEffect*>& effectReferences = this->effectReferences(effect);
     HashSet<FilterEffect*>::iterator end = effectReferences.end();
     for (HashSet<FilterEffect*>::iterator it = effectReferences.begin(); it != end; ++it)
          clearResultsRecursive(*it);
 }
 
 } // namespace WebCore