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

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2333713002

Review-Url: https://codereview.chromium.org/2333713002
diff --git a/bench/BitmapRegionDecoderBench.cpp b/bench/BitmapRegionDecoderBench.cpp
index 709ad0e..dd60b18 100644
--- a/bench/BitmapRegionDecoderBench.cpp
+++ b/bench/BitmapRegionDecoderBench.cpp
@@ -36,8 +36,7 @@
 }
 
 void BitmapRegionDecoderBench::onDelayedSetup() {
-    fBRD.reset(SkBitmapRegionDecoder::Create(fData.get(),
-                                             SkBitmapRegionDecoder::kAndroidCodec_Strategy));
+    fBRD.reset(SkBitmapRegionDecoder::Create(fData, SkBitmapRegionDecoder::kAndroidCodec_Strategy));
 }
 
 void BitmapRegionDecoderBench::onDraw(int n, SkCanvas* canvas) {