Revert of SkScaledCodec class

src/codec/SkCodec_libpng.h

Index: src/codec/SkCodec_libpng.h
diff --git a/src/codec/SkCodec_libpng.h b/src/codec/SkCodec_libpng.h
index e8807499ea74419a7e81535a01c44af589f24466..890402200c77904366548c699e089f6dabe0afcc 100644
--- a/src/codec/SkCodec_libpng.h
+++ b/src/codec/SkCodec_libpng.h
@@ -37,7 +37,6 @@
     SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedFormat; }
     bool onRewind() override;
     bool onReallyHasAlpha() const override { return fReallyHasAlpha; }
-
 private:
     png_structp                 fPng_ptr;
     png_infop                   fInfo_ptr;
@@ -53,6 +52,7 @@
 
     SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop, int);
 
+
     // Helper to set up swizzler and color table. Also calls png_read_update_info.
     Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&,
                               SkPMColor*, int* ctableCount);