change flattenable factory to return sk_sp

tests/PDFPrimitivesTest.cpp

Index: tests/PDFPrimitivesTest.cpp
diff --git a/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index 57b0b60b8726ac05ab12deb1e802785ecf1f6351..f4c29b358db6a3dde8fe34848d87f061dfec675f 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -381,10 +381,10 @@ private:
     mutable bool fVisited;
 };
 
-SkFlattenable* DummyImageFilter::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> DummyImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
     bool visited = buffer.readBool();
-    return new DummyImageFilter(visited);
+    return sk_make_sp<DummyImageFilter>(visited);
 }
 
 #ifndef SK_IGNORE_TO_STRING