change flattenable factory to return sk_sp

src/effects/SkBlurImageFilter.cpp

Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
index c7964c32189fe89fc9aeef8092d75496290d73c0..e7b326b7a9dd2066df7d90532fa7f301ff8ebf2a 100644
--- a/src/effects/SkBlurImageFilter.cpp
+++ b/src/effects/SkBlurImageFilter.cpp
@@ -42,11 +42,12 @@ SkBlurImageFilter::SkBlurImageFilter(SkScalar sigmaX,
     : INHERITED(1, &input, cropRect), fSigma(SkSize::Make(sigmaX, sigmaY)) {
 }
 
-SkFlattenable* SkBlurImageFilter::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkBlurImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar sigmaX = buffer.readScalar();
     SkScalar sigmaY = buffer.readScalar();
-    return Create(sigmaX, sigmaY, common.getInput(0).get(), &common.cropRect());
+    return sk_sp<SkFlattenable>(Create(sigmaX, sigmaY, common.getInput(0).get(),
+                                       &common.cropRect()));
 }
 
 void SkBlurImageFilter::flatten(SkWriteBuffer& buffer) const {