Remove duplicated headers from core/

Source/core/rendering/RenderLayerFilterInfo.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 13 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/rendering/RenderLayerFilterInfo.h"
 
-#include "core/fetch/DocumentResource.h"
 #include "core/fetch/DocumentResourceReference.h"
 #include "core/platform/graphics/filters/custom/CustomFilterOperation.h"
 #include "core/platform/graphics/filters/custom/CustomFilterProgram.h"
 #include "core/rendering/FilterEffectRenderer.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/svg/ReferenceFilterBuilder.h"
 #include "core/rendering/svg/RenderSVGResourceContainer.h"
 #include "core/svg/SVGFilterElement.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 #include "core/svg/graphics/filters/SVGFilter.h"
@@ skipping 141 matching lines @@
 
 void RenderLayerFilterInfo::removeCustomFilterClients()
 {
     for (size_t i = 0; i < m_cachedCustomFilterPrograms.size(); ++i)
         m_cachedCustomFilterPrograms.at(i)->removeClient(this);
     m_cachedCustomFilterPrograms.clear();
 }
 
 } // namespace WebCore