Another trivial cleanup

src/gpu/effects/GrConfigConversionEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrConfigConversionEffect_DEFINED
 #define GrConfigConversionEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
 
-class GrFragmentStage;
 class GrInvariantOutput;
 
 /**
  * This class is used to perform config conversions. Clients may want to read/write data that is
  * unpremultiplied. Also on some systems reading/writing BGRA or RGBA is faster. In those cases we
  * read/write using the faster path and perform an R/B swap in the shader if the client data is in
  * the slower config.
  */
 class GrConfigConversionEffect : public GrSingleTextureEffect {
 public:
@@ skipping 44 matching lines @@
 
     bool            fSwapRedAndBlue;
     PMConversion    fPMConversion;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif