Switch SkLocalMatrixImageFilter and SkPaintImageFilter over to sk_sp

tests/PaintImageFilterTest.cpp

Index: tests/PaintImageFilterTest.cpp
diff --git a/tests/PaintImageFilterTest.cpp b/tests/PaintImageFilterTest.cpp
index f1c0c2eb9739bd563273e15da4c0c4ff19f60a5a..03653368abc568cd8fa4c014c255e5acd8b1fb38 100644
--- a/tests/PaintImageFilterTest.cpp
+++ b/tests/PaintImageFilterTest.cpp
@@ -38,7 +38,7 @@ static void test_unscaled(skiatest::Reporter* reporter) {
     {
         SkPaint paint;
         SkImageFilter::CropRect cr(r);
-        paint.setImageFilter(SkPaintImageFilter::Create(gradientPaint, &cr))->unref();
+        paint.setImageFilter(SkPaintImageFilter::Make(gradientPaint, &cr));
         canvasFilter.drawRect(r, paint);
     }
 
@@ -84,7 +84,7 @@ static void test_scaled(skiatest::Reporter* reporter) {
     {
         SkPaint paint;
         SkImageFilter::CropRect cr(r);
-        paint.setImageFilter(SkPaintImageFilter::Create(gradientPaint, &cr))->unref();
+        paint.setImageFilter(SkPaintImageFilter::Make(gradientPaint, &cr));
         canvasFilter.scale(SkIntToScalar(2), SkIntToScalar(2));
         canvasFilter.drawRect(r, paint);
     }