use unique_ptr for codec factories

Will need guards for android (at least)

Bug: skia:
Change-Id: I2bb8e656997984489ef1f2e41cd3d301c4e7b947
Reviewed-on: https://skia-review.googlesource.com/26040
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/gm/readpixels.cpp b/gm/readpixels.cpp
index 69d22bb..bd2fe9b 100644
--- a/gm/readpixels.cpp
+++ b/gm/readpixels.cpp
@@ -52,7 +52,7 @@
 
 static sk_sp<SkImage> make_raster_image(SkColorType colorType) {
     std::unique_ptr<SkStream> stream(GetResourceAsStream("google_chrome.ico"));
-    std::unique_ptr<SkCodec> codec(SkCodec::NewFromStream(stream.release()));
+    std::unique_ptr<SkCodec> codec = SkCodec::MakeFromStream(std::move(stream));
 
     SkBitmap bitmap;
     SkImageInfo info = codec->getInfo().makeWH(kWidth, kHeight)