remove DownSample imagefilter
was just created early on as a test filter

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2094083002

TBR=

Review-Url: https://codereview.chromium.org/2094083002
diff --git a/samplecode/SampleFilterFuzz.cpp b/samplecode/SampleFilterFuzz.cpp
index 78bc673..7a53f4f 100644
--- a/samplecode/SampleFilterFuzz.cpp
+++ b/samplecode/SampleFilterFuzz.cpp
@@ -41,7 +41,6 @@
 #include "SkPoint3.h"
 #include "SkRandom.h"
 #include "SkTableColorFilter.h"
-#include "SkTestImageFilters.h"
 #include "SkTileImageFilter.h"
 #include "SkTypeface.h"
 #include "SkView.h"
@@ -545,7 +544,7 @@
     }
 
     enum { ALPHA_THRESHOLD, MERGE, COLOR, LUT3D, BLUR, MAGNIFIER,
-           DOWN_SAMPLE, XFERMODE, OFFSET, MATRIX, MATRIX_CONVOLUTION, COMPOSE,
+           XFERMODE, OFFSET, MATRIX, MATRIX_CONVOLUTION, COMPOSE,
            DISTANT_LIGHT, POINT_LIGHT, SPOT_LIGHT, NOISE, DROP_SHADOW,
            MORPHOLOGY, BITMAP, DISPLACE, TILE, PICTURE, PAINT, NUM_FILTERS };
 
@@ -585,9 +584,6 @@
                                               make_scalar(true),
                                               make_image_filter());
         break;
-    case DOWN_SAMPLE:
-        filter = SkDownSampleImageFilter::Make(make_scalar(), make_image_filter());
-        break;
     case XFERMODE:
         filter = SkXfermodeImageFilter::Make(SkXfermode::Make(make_xfermode()),
                                              make_image_filter(),