remove alphatype from colortable

src/images/SkImageDecoder_libgif.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 "SkColor.h"
 #include "SkColorPriv.h"
 #include "SkColorTable.h"
@@ skipping 314 matching lines @@
                 return true;
             }
 
 
             // now we decode the colortable
             int colorCount = 0;
             {
                 // Declare colorPtr here for scope.
                 SkPMColor colorPtr[256]; // storage for worst-case
                 const ColorMapObject* cmap = find_colormap(gif);
-                SkAlphaType alphaType = kOpaque_SkAlphaType;
                 if (cmap != NULL) {
                     SkASSERT(cmap->ColorCount == (1 << (cmap->BitsPerPixel)));
                     colorCount = cmap->ColorCount;
                     if (colorCount > 256) {
                         colorCount = 256;  // our kIndex8 can't support more
                     }
                     for (int index = 0; index < colorCount; index++) {
                         colorPtr[index] = SkPackARGB32(0xFF,
                                                        cmap->Colors[index].Red,
                                                        cmap->Colors[index].Green,
                                                        cmap->Colors[index].Blue);
                     }
                 } else {
                     // find_colormap() returned NULL.  Some (rare, broken)
                     // GIFs don't have a color table, so we force one.
                     gif_warning(*bm, "missing colormap");
                     colorCount = 256;
                     sk_memset32(colorPtr, SK_ColorWHITE, colorCount);
                 }
                 transpIndex = find_transpIndex(temp_save, colorCount);
                 if (transpIndex >= 0) {
                     colorPtr[transpIndex] = SK_ColorTRANSPARENT; // ram in a transparent SkPMColor
-                    alphaType = kPremul_SkAlphaType;
                     fillIndex = transpIndex;
                 } else if (fillIndex >= colorCount) {
                     // gif->SBackGroundColor should be less than colorCount.
                     fillIndex = 0;  // If not, fix it.
                 }
 
-                SkAutoTUnref<SkColorTable> ctable(SkNEW_ARGS(SkColorTable,
-                                                  (colorPtr, colorCount,
-                                                   alphaType)));
+                SkAutoTUnref<SkColorTable> ctable(SkNEW_ARGS(SkColorTable, (colorPtr, colorCount)));
                 if (!this->allocPixelRef(bm, ctable)) {
                     return error_return(*bm, "allocPixelRef");
                 }
             }
 
             // abort if either inner dimension is <= 0
             if (innerWidth <= 0 || innerHeight <= 0) {
                 return error_return(*bm, "non-pos inner width/height");
             }
 
@@ skipping 153 matching lines @@
 static SkImageDecoder_DecodeReg gReg(sk_libgif_dfactory);
 
 static SkImageDecoder::Format get_format_gif(SkStreamRewindable* stream) {
     if (is_gif(stream)) {
         return SkImageDecoder::kGIF_Format;
     }
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageDecoder_FormatReg gFormatReg(get_format_gif);