Revert of Checking for valid colorType, alphaType, colorSpace in SkCodec

src/codec/SkGifCodec.cpp

Index: src/codec/SkGifCodec.cpp
diff --git a/src/codec/SkGifCodec.cpp b/src/codec/SkGifCodec.cpp
index 1e6e300a9233ec8e24d45c392b877b291154d565..dcc25b8dfd83986724deec6ae9d86b141a46db24 100644
--- a/src/codec/SkGifCodec.cpp
+++ b/src/codec/SkGifCodec.cpp
@@ -450,8 +450,9 @@
 SkCodec::Result SkGifCodec::prepareToDecode(const SkImageInfo& dstInfo, SkPMColor* inputColorPtr,
         int* inputColorCount, const Options& opts) {
     // Check for valid input parameters
-    if (!conversion_possible_ignore_color_space(dstInfo, this->getInfo())) {
-        return gif_error("Cannot convert input type to output type.\n", kInvalidConversion);
+    if (!conversion_possible(dstInfo, this->getInfo())) {
+        return gif_error("Cannot convert input type to output type.\n",
+                kInvalidConversion);
     }
 
     // Initialize color table and copy to the client if necessary