move setshader to sk_sp

bench/PDFBench.cpp

Index: bench/PDFBench.cpp
diff --git a/bench/PDFBench.cpp b/bench/PDFBench.cpp
index 289588a01b6356d0d767b9a9d0bc5d2c470c685e..076f175b7290c38c6899ddfaa882cc81b2a7b4aa 100644
--- a/bench/PDFBench.cpp
+++ b/bench/PDFBench.cpp
@@ -186,7 +186,7 @@ struct PDFShaderBench : public Benchmark {
             SkPDFDocument doc(&nullStream, nullptr, 72, nullptr);
             sk_sp<SkPDFObject> shader(
                     SkPDFShader::GetPDFShader(
-                            &doc, 72, *fShader, SkMatrix::I(),
+                            &doc, 72, fShader.get(), SkMatrix::I(),
                             SkIRect::MakeWH(400,400), 72));
         }
     }