switch colorfilters to sk_sp

samplecode/SampleColorFilter.cpp

Index: samplecode/SampleColorFilter.cpp
diff --git a/samplecode/SampleColorFilter.cpp b/samplecode/SampleColorFilter.cpp
index 4ee8949410e58f72b3b41ee3b962081774eca6f0..0b8acc32d71b7dc2680dd39a737fdf29d409b8e6 100644
--- a/samplecode/SampleColorFilter.cpp
+++ b/samplecode/SampleColorFilter.cpp
@@ -184,8 +184,7 @@ protected:
 
         for (size_t y = 0; y < SK_ARRAY_COUNT(gColors); y++) {
             for (size_t x = 0; x < SK_ARRAY_COUNT(gModes); x++) {
-                SkColorFilter* cf = SkColorFilter::CreateModeFilter(gColors[y], gModes[x]);
-                SkSafeUnref(paint.setColorFilter(cf));
+                paint.setColorFilter(SkColorFilter::MakeModeFilter(gColors[y], gModes[x]));
                 canvas->drawBitmap(fBitmap, x * N * 1.25f, y * N * scale, &paint);
             }
         }