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

tools/visualize_color_gamut.cpp

Index: tools/visualize_color_gamut.cpp
diff --git a/tools/visualize_color_gamut.cpp b/tools/visualize_color_gamut.cpp
index cc15601b7d83286b08a0e4b35fe067ed5b333d14..1bacf5f179c662a07e3a54ca9f647d4ce7b55dc1 100644
--- a/tools/visualize_color_gamut.cpp
+++ b/tools/visualize_color_gamut.cpp
@@ -124,7 +124,7 @@ int main(int argc, char** argv) {
         SkDebugf("Cannot find input image.\n");
         return -1;
     }
-    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data.get()));
+    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data));
     if (!codec) {
         SkDebugf("Invalid input image.\n");
         return -1;