SkPDF: PDFStream has-a not is-a PDFDict

bench/PDFBench.cpp

Index: bench/PDFBench.cpp
diff --git a/bench/PDFBench.cpp b/bench/PDFBench.cpp
index 19f8e2f8cd061bca7c06710b01374a2e778a88f0..5b33e8ca152d2d1c9b4d8bf3e2c61819e1c76ae9 100644
--- a/bench/PDFBench.cpp
+++ b/bench/PDFBench.cpp
@@ -137,8 +137,9 @@ protected:
         SkASSERT(fAsset);
         if (!fAsset) { return; }
         while (loops-- > 0) {
-            sk_sp<SkPDFObject> object(
-                    new SkPDFSharedStream(fAsset->duplicate()));
+            sk_sp<SkPDFObject> object =
+                sk_make_sp<SkPDFSharedStream>(
+                        std::unique_ptr<SkStreamAsset>(fAsset->duplicate()));
             test_pdf_object_serialization(object);
         }
     }