Make sp variants for SkData

src/core/SkPaint.cpp

Index: src/core/SkPaint.cpp
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index 678b1a1102558355c430f851a5f355290367cb0a..f7959429a712a9f44b5fe1e5fb69d5f3920fa947 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -1943,7 +1943,7 @@ void SkPaint::unflatten(SkReadBuffer& buffer) {
                 // Annotations have moved to drawAnnotation, so we just drop this one on the floor.
                 SkString key;
                 buffer.readString(&key);
-                SkSafeUnref(buffer.readByteArrayAsData());
+                (void)buffer.readByteArrayAsData();
             }
         }
     } else {