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/samplecode/DecodeFile.h b/samplecode/DecodeFile.h
index 1ae98a4..eeb1cce 100644
--- a/samplecode/DecodeFile.h
+++ b/samplecode/DecodeFile.h
@@ -17,7 +17,7 @@
                                SkColorType colorType = kN32_SkColorType,
                                bool requireUnpremul = false) {
     sk_sp<SkData> data(SkData::MakeFromFileName(filename));
-    std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data));
+    std::unique_ptr<SkCodec> codec = SkCodec::MakeFromData(data);
     if (!codec) {
         return false;
     }