Make SkColorSpaceXform::New() take bare ptrs

tests/ColorSpaceXformTest.cpp

Index: tests/ColorSpaceXformTest.cpp
diff --git a/tests/ColorSpaceXformTest.cpp b/tests/ColorSpaceXformTest.cpp
index 2401af582b0ba6335778ad4c30df68a882bedb0e..156b2da020e868fabc88617dc562f1d5a4c0e329 100644
--- a/tests/ColorSpaceXformTest.cpp
+++ b/tests/ColorSpaceXformTest.cpp
@@ -22,7 +22,7 @@ public:
                 nullptr, kNonStandard_SkGammaNamed, gammas, SkMatrix::I(), nullptr));
 
         // Use special testing entry point, so we don't skip the xform, even though src == dst.
-        return SlowIdentityXform(space);
+        return SlowIdentityXform(space.get());
     }
 };