Convert SkAutoTUnref<SkData> to sk_sp<SkData>.

With the move from SkData::NewXXX to SkData::MakeXXX most
SkAutoTUnref<SkData> were changed to sk_sp<SkData>. However,
there are still a few SkAutoTUnref<SkData> around, so clean
them up.

Review-Url: https://codereview.chromium.org/2212493002
diff --git a/tests/StreamTest.cpp b/tests/StreamTest.cpp
index 50523ff..5697782 100644
--- a/tests/StreamTest.cpp
+++ b/tests/StreamTest.cpp
@@ -117,7 +117,7 @@
     REPORTER_ASSERT(reporter, ds.getOffset() == 100 * 26);
 
     {
-        SkAutoTUnref<SkData> data(ds.copyToData());
+        sk_sp<SkData> data(ds.copyToData());
         REPORTER_ASSERT(reporter, 100 * 26 == data->size());
         REPORTER_ASSERT(reporter, memcmp(dst, data->data(), data->size()) == 0);
     }
@@ -404,7 +404,7 @@
         ERRORF(reporter, "SkStreamCopy failed");
         return;
     }
-    SkAutoTUnref<SkData> data(tgt.copyToData());
+    sk_sp<SkData> data(tgt.copyToData());
     tgt.reset();
     if (data->size() != N) {
         ERRORF(reporter, "SkStreamCopy incorrect size");