change flattenable factory to return sk_sp

src/core/SkShader.cpp

Index: src/core/SkShader.cpp
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index e4cbc7b2171340a1ec00aab1f976fdcdadec9629..8032cc6e4cbc1655640b37359a56857cf2b17270 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -264,8 +264,8 @@ bool SkColorShader::isOpaque() const {
     return SkColorGetA(fColor) == 255;
 }
 
-SkFlattenable* SkColorShader::CreateProc(SkReadBuffer& buffer) {
-    return new SkColorShader(buffer.readColor());
+sk_sp<SkFlattenable> SkColorShader::CreateProc(SkReadBuffer& buffer) {
+    return sk_make_sp<SkColorShader>(buffer.readColor());
 }
 
 void SkColorShader::flatten(SkWriteBuffer& buffer) const {
@@ -419,8 +419,8 @@ bool SkColorShader::ColorShaderContext::onChooseBlitProcs(const SkImageInfo& inf
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkFlattenable* SkEmptyShader::CreateProc(SkReadBuffer&) {
-    return SkShader::MakeEmptyShader().release();
+sk_sp<SkFlattenable> SkEmptyShader::CreateProc(SkReadBuffer&) {
+    return SkShader::MakeEmptyShader();
 }
 
 #ifndef SK_IGNORE_TO_STRING