remove DownSample imagefilter

gm/imagefiltersgraph.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkArithmeticMode.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorFilter.h"
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
 #include "SkMatrixConvolutionImageFilter.h"
 #include "SkOffsetImageFilter.h"
 #include "SkReadBuffer.h"
 #include "SkSpecialImage.h"
 #include "SkSpecialSurface.h"
 #include "SkWriteBuffer.h"
 #include "SkMergeImageFilter.h"
 #include "SkMorphologyImageFilter.h"
-#include "SkTestImageFilters.h"
 #include "SkXfermodeImageFilter.h"
 
 class ImageFiltersGraphGM : public skiagm::GM {
 public:
     ImageFiltersGraphGM() {}
 
 protected:
 
     SkString onShortName() override {
         return SkString("imagefiltersgraph");
@@ skipping 142 matching lines @@
     }
 
     sk_sp<SkImage> fImage;
 
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageFiltersGraphGM;)