Make SkColorSpaceXform::New() take bare ptrs

bench/ColorCodecBench.cpp

Index: bench/ColorCodecBench.cpp
diff --git a/bench/ColorCodecBench.cpp b/bench/ColorCodecBench.cpp
index faa2a9a11886aab131c609d1460407d973043e1f..84d4f9232db8eef16d52eb29267023d03096a30f 100644
--- a/bench/ColorCodecBench.cpp
+++ b/bench/ColorCodecBench.cpp
@@ -94,7 +94,8 @@ void ColorCodecBench::xformOnly() {
     if (!srcSpace) {
         srcSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
     }
-    std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace, fDstSpace);
+    std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace.get(),
+                                                                      fDstSpace.get());
     SkASSERT(xform);
 
     void* dst = fDst.get();