Revert of Scanline decoding for gifs

src/codec/SkCodecPriv.h

Index: src/codec/SkCodecPriv.h
diff --git a/src/codec/SkCodecPriv.h b/src/codec/SkCodecPriv.h
index 2769cec1cd4025f15611d4c9e5d53e65cb2eb47b..726074195daf23d787c0187520baa9a4a97e1e86 100644
--- a/src/codec/SkCodecPriv.h
+++ b/src/codec/SkCodecPriv.h
@@ -29,17 +29,6 @@
 
 #define COMPUTE_RESULT_ALPHA                    \
     SkSwizzler::GetResult(zeroAlpha, maxAlpha);
-
-/*
- * returns a scaled dimension based on the original dimension and the sampleSize
- * NOTE: we round down here for scaled dimension to match the behavior of SkImageDecoder
- */
-static int get_scaled_dimension(int srcDimension, int sampleSize) {
-    if (sampleSize > srcDimension) {
-        return 1;
-    }
-    return srcDimension / sampleSize;
-}
 
 /*
  * Returns the first coordinate that we will keep during a scaled decode.
@@ -148,7 +137,7 @@
         SkASSERT(nullptr != inputColorPtr);
         SkASSERT(nullptr != inputColorCount);
         SkASSERT(nullptr != colorTable);
-        memcpy(inputColorPtr, colorTable->readColors(), *inputColorCount * sizeof(SkPMColor));
+        memcpy(inputColorPtr, colorTable->readColors(), *inputColorCount * 4);
     }
 }