Make SkColorSpaceXform::New() take bare ptrs

src/codec/SkWebpCodec.cpp

Index: src/codec/SkWebpCodec.cpp
diff --git a/src/codec/SkWebpCodec.cpp b/src/codec/SkWebpCodec.cpp
index 86bda576e4b2d6801e5834d17108313eac1dd455..e25a57f6e54aa9e141ef3583e1a2070558504ed6 100644
--- a/src/codec/SkWebpCodec.cpp
+++ b/src/codec/SkWebpCodec.cpp
@@ -199,8 +199,7 @@ SkCodec::Result SkWebpCodec::onGetPixels(const SkImageInfo& dstInfo, void* dst,
 
     std::unique_ptr<SkColorSpaceXform> colorXform = nullptr;
     if (needs_color_xform(dstInfo, this->getInfo())) {
-        colorXform = SkColorSpaceXform::New(sk_ref_sp(this->getInfo().colorSpace()),
-                                            sk_ref_sp(dstInfo.colorSpace()));
+        colorXform = SkColorSpaceXform::New(this->getInfo().colorSpace(), dstInfo.colorSpace());
         SkASSERT(colorXform);
     }