Remove opaque alpha channel special case

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

Index: third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
index 307e6a4f93d4c67f6793c152bb4172390813ec37..ea03704ba925dac0a9468124c7e07d8750306879 100644
--- a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
@@ -157,10 +157,8 @@ bool GIFImageDecoder::haveDecodedRow(size_t frameIndex,
       if ((sourceValue != transparentPixel) &&
           (sourceValue < colorTable.size())) {
         *currentAddress = colorTableIter[sourceValue];
-      } else {
+      } else
         *currentAddress = 0;
-        m_currentBufferSawAlpha = true;
-      }
     }
   } else {
     for (; rowBegin != rowEnd; ++rowBegin, ++currentAddress) {
@@ -168,8 +166,6 @@ bool GIFImageDecoder::haveDecodedRow(size_t frameIndex,
       if ((sourceValue != transparentPixel) &&
           (sourceValue < colorTable.size()))
         *currentAddress = colorTableIter[sourceValue];
-      else
-        m_currentBufferSawAlpha = true;
     }
   }
 
@@ -191,9 +187,6 @@ bool GIFImageDecoder::frameComplete(size_t frameIndex) {
   if (!initFrameBuffer(frameIndex))
     return setFailed();
 
-  if (!m_currentBufferSawAlpha)
-    correctAlphaWhenFrameBufferSawNoAlpha(frameIndex);
-
   m_frameBufferCache[frameIndex].setStatus(ImageFrame::FrameComplete);
 
   return true;
@@ -269,10 +262,6 @@ void GIFImageDecoder::parse(GIFParseQuery query) {
     setFailed();
 }
 
-void GIFImageDecoder::onInitFrameBuffer(size_t frameIndex) {
-  m_currentBufferSawAlpha = false;
-}
-
 bool GIFImageDecoder::canReusePreviousFrameBuffer(size_t frameIndex) const {
   DCHECK(frameIndex < m_frameBufferCache.size());
   return m_frameBufferCache[frameIndex].getDisposalMethod() !=