change flattenable factory to return sk_sp

src/effects/Sk2DPathEffect.cpp

Index: src/effects/Sk2DPathEffect.cpp
diff --git a/src/effects/Sk2DPathEffect.cpp b/src/effects/Sk2DPathEffect.cpp
index da43d22487185854d1eedd54ba2f7dbc5e902770..52e3fa5e1c88b63d3f7c797a5ab736a7e8feb81f 100644
--- a/src/effects/Sk2DPathEffect.cpp
+++ b/src/effects/Sk2DPathEffect.cpp
@@ -106,11 +106,11 @@ void SkLine2DPathEffect::nextSpan(int u, int v, int ucount, SkPath* dst) const {
     }
 }
 
-SkFlattenable* SkLine2DPathEffect::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkLine2DPathEffect::CreateProc(SkReadBuffer& buffer) {
     SkMatrix matrix;
     buffer.readMatrix(&matrix);
     SkScalar width = buffer.readScalar();
-    return SkLine2DPathEffect::Make(width, matrix).release();
+    return SkLine2DPathEffect::Make(width, matrix);
 }
 
 void SkLine2DPathEffect::flatten(SkWriteBuffer &buffer) const {
@@ -134,12 +134,12 @@ SkPath2DPathEffect::SkPath2DPathEffect(const SkMatrix& m, const SkPath& p)
     : INHERITED(m), fPath(p) {
 }
 
-SkFlattenable* SkPath2DPathEffect::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkPath2DPathEffect::CreateProc(SkReadBuffer& buffer) {
     SkMatrix matrix;
     buffer.readMatrix(&matrix);
     SkPath path;
     buffer.readPath(&path);
-    return SkPath2DPathEffect::Make(matrix, path).release();
+    return SkPath2DPathEffect::Make(matrix, path);
 }
 
 void SkPath2DPathEffect::flatten(SkWriteBuffer& buffer) const {