Remove opaque alpha channel special case

third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoder.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * Portions are Copyright (C) 2001-6 mozilla.org
  *
  * Other contributors:
  *   Stuart Parmenter <stuart@mozilla.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 925 matching lines @@
               static_cast<JDIMENSION>(decoded_size_.Height()));
 
     if (!buffer.AllocatePixelData(info->output_width, info->output_height,
                                   ColorSpaceForSkImages()))
       return SetFailed();
 
     buffer.ZeroFillPixelData();
     // The buffer is transparent outside the decoded area while the image is
     // loading. The image will be marked fully opaque in Complete().
     buffer.SetStatus(ImageFrame::kFramePartial);
-    buffer.SetHasAlpha(true);
 
     // For JPEGs, the frame always fills the entire image.
     buffer.SetOriginalFrameRect(IntRect(IntPoint(), Size()));
   }
 
 #if defined(TURBO_JPEG_RGB_SWIZZLE)
   if (turboSwizzled(info->out_color_space)) {
     while (info->output_scanline < info->output_height) {
       unsigned char* row = reinterpret_cast_ptr<unsigned char*>(
           buffer.GetAddr(0, info->output_scanline));
@@ skipping 51 matching lines @@
   // has failed.
   if (!reader_->Decode(only_size) && IsAllDataReceived())
     SetFailed();
 
   // If decoding is done or failed, we don't need the JPEGImageReader anymore.
   if (IsComplete(this, only_size) || Failed())
     reader_.reset();
 }
 
 }  // namespace blink