Revert of - Add astcbitmap to gm slides

src/images/SkImageDecoder.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkImageDecoder.h"
 #include "SkBitmap.h"
@@ skipping 68 matching lines @@
         case kBMP_Format:
             return "BMP";
         case kGIF_Format:
             return "GIF";
         case kICO_Format:
             return "ICO";
         case kPKM_Format:
             return "PKM";
         case kKTX_Format:
             return "KTX";
-        case kASTC_Format:
-            return "ASTC";
         case kJPEG_Format:
             return "JPEG";
         case kPNG_Format:
             return "PNG";
         case kWBMP_Format:
             return "WBMP";
         case kWEBP_Format:
             return "WEBP";
         default:
             SkDEBUGFAIL("Invalid format type!");
@@ skipping 217 matching lines @@
             if (kUnknown_Format == *format) {
                 if (stream->rewind()) {
                     *format = GetStreamFormat(stream);
                 }
             }
         }
         delete codec;
     }
     return success;
 }