WTF::notFound looks too much like a local variable.

Source/core/platform/image-decoders/ImageDecoder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 139 matching lines @@
 void ImageDecoder::clearFrameBuffer(size_t frameIndex)
 {
     m_frameBufferCache[frameIndex].clearPixelData();
 }
 
 size_t ImageDecoder::findRequiredPreviousFrame(size_t frameIndex, bool frameRectIsOpaque)
 {
     ASSERT(frameIndex <= m_frameBufferCache.size());
     if (!frameIndex) {
         // The first frame doesn't rely on any previous data.
-        return notFound;
+        return kNotFound;
     }
 
     const ImageFrame* currBuffer = &m_frameBufferCache[frameIndex];
     if ((frameRectIsOpaque || currBuffer->alphaBlendSource() == ImageFrame::BlendAtopBgcolor)
         && currBuffer->originalFrameRect().contains(IntRect(IntPoint(), size())))
-        return notFound;
+        return kNotFound;
 
     // The starting state for this frame depends on the previous frame's
     // disposal method.
     size_t prevFrame = frameIndex - 1;
     const ImageFrame* prevBuffer = &m_frameBufferCache[prevFrame];
     ASSERT(prevBuffer->requiredPreviousFrameIndexValid());
 
     switch (prevBuffer->disposalMethod()) {
     case ImageFrame::DisposeNotSpecified:
     case ImageFrame::DisposeKeep:
         // prevFrame will be used as the starting state for this frame.
         // FIXME: Be even smarter by checking the frame sizes and/or alpha-containing regions.
         return prevFrame;
     case ImageFrame::DisposeOverwritePrevious:
         // Frames that use the DisposeOverwritePrevious method are effectively
         // no-ops in terms of changing the starting state of a frame compared to
         // the starting state of the previous frame, so skip over them and
         // return the required previous frame of it.
         return prevBuffer->requiredPreviousFrameIndex();
     case ImageFrame::DisposeOverwriteBgcolor:
         // If the previous frame fills the whole image, then the current frame
         // can be decoded alone. Likewise, if the previous frame could be
         // decoded without reference to any prior frame, the starting state for
         // this frame is a blank frame, so it can again be decoded alone.
         // Otherwise, the previous frame contributes to this frame.
         return (prevBuffer->originalFrameRect().contains(IntRect(IntPoint(), size()))
-            || (prevBuffer->requiredPreviousFrameIndex() == notFound)) ? notFound : prevFrame;
+            || (prevBuffer->requiredPreviousFrameIndex() == kNotFound)) ? kNotFound : prevFrame;
     default:
         ASSERT_NOT_REACHED();
-        return notFound;
+        return kNotFound;
     }
 }
 
 } // namespace WebCore