change flattenable factory to return sk_sp

tests/ImageFilterTest.cpp

Index: tests/ImageFilterTest.cpp
diff --git a/tests/ImageFilterTest.cpp b/tests/ImageFilterTest.cpp
index dda899b4f3d7f6d5cbb6e20a7de268e737ed81c8..3f60286e39d6da3b3369bbc22f21c65fa407030b 100644
--- a/tests/ImageFilterTest.cpp
+++ b/tests/ImageFilterTest.cpp
@@ -219,12 +219,12 @@ private:
 
 }
 
-SkFlattenable* MatrixTestImageFilter::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> MatrixTestImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     skiatest::Reporter* reporter = (skiatest::Reporter*)buffer.readFunctionPtr();
     SkMatrix matrix;
     buffer.readMatrix(&matrix);
-    return new MatrixTestImageFilter(reporter, matrix);
+    return sk_make_sp<MatrixTestImageFilter>(reporter, matrix);
 }
 
 #ifndef SK_IGNORE_TO_STRING