change SkStreams to work with sk_sp<SkData> instead of SkData*

tests/TypefaceTest.cpp

Index: tests/TypefaceTest.cpp
diff --git a/tests/TypefaceTest.cpp b/tests/TypefaceTest.cpp
index 6f803ce11f2cb5e4321d3450146ef7d8fe30c816..436f129a63904ecf2dd379b7204715eefdbb65ea 100644
--- a/tests/TypefaceTest.cpp
+++ b/tests/TypefaceTest.cpp
@@ -21,12 +21,11 @@ static void TypefaceStyle_test(skiatest::Reporter* reporter,
                                uint16_t weight, uint16_t width, SkData* data)
 {
     sk_sp<SkData> dataCopy;
-    SkData* dataToUse = data;
-    if (!dataToUse->unique()) {
+    if (!data->unique()) {
         dataCopy = SkData::MakeWithCopy(data->data(), data->size());
-        dataToUse = dataCopy.get();
+        data = dataCopy.get();
     }
-    SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(dataToUse->writable_data());
+    SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(data->writable_data());
 
     SkSFNTHeader::TableDirectoryEntry* tableEntry =
         SkTAfter<SkSFNTHeader::TableDirectoryEntry>(sfntHeader);
@@ -46,7 +45,7 @@ static void TypefaceStyle_test(skiatest::Reporter* reporter,
     using WidthType = SkOTTableOS2_V0::WidthClass::Value;
     os2Table->usWidthClass.value = static_cast<WidthType>(SkEndian_SwapBE16(width));
 
-    sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(dataToUse)));
+    sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(sk_ref_sp(data))));
     SkASSERT_RELEASE(newTypeface);
 
     SkFontStyle newStyle = newTypeface->fontStyle();