Drop some dead code from FilterEffect

Source/core/paint/FilterEffectBuilder.h

 /*
  * Copyright (C) 2011 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<FilterEffectBuilder> create()
     {
         return adoptRefWillBeNoop(new FilterEffectBuilder());
     }
 
     virtual ~FilterEffectBuilder();
     DECLARE_TRACE();
 
     bool build(LayoutObject* renderer, const FilterOperations&);
-    void clearIntermediateResults();
 
     PassRefPtrWillBeRawPtr<FilterEffect> lastEffect() const
     {
         return m_lastEffect;
     }
 
 private:
     FilterEffectBuilder();
 
     RefPtrWillBeMember<FilterEffect> m_lastEffect;
     WillBeHeapVector<RefPtrWillBeMember<ReferenceFilter>> m_referenceFilters;
 };
 
 } // namespace blink
 
 #endif // FilterEffectBuilder_h