Revert of - Add astcbitmap to gm slides

tests/ImageDecodingTest.cpp

Index: tests/ImageDecodingTest.cpp
diff --git a/tests/ImageDecodingTest.cpp b/tests/ImageDecodingTest.cpp
index 8838e755662eeade7a713cd2390b74aaa3a0711b..5e636113481e3b32cfe1766b0153d0c023ad207a 100644
--- a/tests/ImageDecodingTest.cpp
+++ b/tests/ImageDecodingTest.cpp
@@ -55,10 +55,9 @@
         // decoders do not, so skip them as well.
         case SkImageDecoder::kICO_Format:
         case SkImageDecoder::kBMP_Format:
-        // KTX and ASTC are texture formats so it's not particularly clear how to 
-        // decode the alpha from them.
+        // KTX is a Texture format so it's not particularly clear how to 
+        // decode the alpha from it.
         case SkImageDecoder::kKTX_Format:
-        case SkImageDecoder::kASTC_Format:
         // The rest of these are opaque.
         case SkImageDecoder::kPKM_Format:
         case SkImageDecoder::kWBMP_Format: