Remove opaque alpha channel special case

third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 374 matching lines @@
   ASSERT_TRUE(unpremul_decoder->FrameCount());
   ImageFrame* premul_frame = premul_decoder->FrameBufferAtIndex(0);
   EXPECT_TRUE(premul_frame &&
               premul_frame->GetStatus() != ImageFrame::kFrameComplete);
   EXPECT_EQ(premul_frame->Bitmap().alphaType(), kPremul_SkAlphaType);
   ImageFrame* unpremul_frame = unpremul_decoder->FrameBufferAtIndex(0);
   EXPECT_TRUE(unpremul_frame &&
               unpremul_frame->GetStatus() != ImageFrame::kFrameComplete);
   EXPECT_EQ(unpremul_frame->Bitmap().alphaType(), kUnpremul_SkAlphaType);
 
-  // Fully decoded frame => the frame alpha type is known (opaque).
+  // Fully decoded frame
   premul_decoder->SetData(full_data.Get(), true);
   ASSERT_TRUE(premul_decoder->FrameCount());
   unpremul_decoder->SetData(full_data.Get(), true);
   ASSERT_TRUE(unpremul_decoder->FrameCount());
   premul_frame = premul_decoder->FrameBufferAtIndex(0);
   EXPECT_TRUE(premul_frame &&
               premul_frame->GetStatus() == ImageFrame::kFrameComplete);
   EXPECT_EQ(premul_frame->Bitmap().alphaType(), kOpaque_SkAlphaType);
   unpremul_frame = unpremul_decoder->FrameBufferAtIndex(0);
   EXPECT_TRUE(unpremul_frame &&
@@ skipping 25 matching lines @@
   EXPECT_EQ(1u, decoder->FrameCount());
   ImageFrame* frame = decoder->FrameBufferAtIndex(0);
   decoder->SetMemoryAllocator(nullptr);
 
   ASSERT_TRUE(frame);
   EXPECT_EQ(IntRect(IntPoint(), decoder->Size()), frame->OriginalFrameRect());
   EXPECT_FALSE(frame->HasAlpha());
 }
 
 }  // namespace blink