Drop some dead code from FilterEffect

Source/core/paint/FilterEffectBuilder.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google 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
@@ skipping 225 matching lines @@
     // can share cached resources across frames.
     m_lastEffect = previousEffect;
 
     // If we didn't make any effects, tell our caller we are not valid
     if (!m_lastEffect.get())
         return false;
 
     return true;
 }
 
-void FilterEffectBuilder::clearIntermediateResults()
-{
-    if (m_lastEffect.get())
-        m_lastEffect->clearResultsRecursive();
-}
-
-
 } // namespace blink