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/src/codec/SkCodecImageGenerator.h b/src/codec/SkCodecImageGenerator.h
index 4d0c078..1b2cbc2 100644
--- a/src/codec/SkCodecImageGenerator.h
+++ b/src/codec/SkCodecImageGenerator.h
@@ -34,7 +34,7 @@
     /*
      * Takes ownership of codec
      */
-    SkCodecImageGenerator(SkCodec* codec, sk_sp<SkData>);
+    SkCodecImageGenerator(std::unique_ptr<SkCodec>, sk_sp<SkData>);
 
     std::unique_ptr<SkCodec> fCodec;
     sk_sp<SkData> fData;