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

Source/core/platform/image-decoders/gif/GIFImageReader.h

 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 171 matching lines @@
 // Frame output state machine.
 struct GIFFrameContext {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     GIFFrameContext(int id)
         : m_frameId(id)
         , m_xOffset(0)
         , m_yOffset(0)
         , m_width(0)
         , m_height(0)
-        , m_transparentPixel(notFound)
+        , m_transparentPixel(kNotFound)
         , m_disposalMethod(WebCore::ImageFrame::DisposeNotSpecified)
         , m_dataSize(0)
         , m_progressiveDisplay(false)
         , m_interlaced(false)
         , m_delayTime(0)
         , m_currentLzwBlock(0)
         , m_isComplete(false)
         , m_isHeaderDefined(false)
         , m_isDataSizeDefined(false)
     {
@@ skipping 48 matching lines @@
     void clearDecodeState() { m_lzwContext.clear(); }
     const GIFColorMap& localColorMap() const { return m_localColorMap; }
     GIFColorMap& localColorMap() { return m_localColorMap; }
 
 private:
     int m_frameId;
     unsigned m_xOffset;
     unsigned m_yOffset; // With respect to "screen" origin.
     unsigned m_width;
     unsigned m_height;
-    size_t m_transparentPixel; // Index of transparent pixel. Value is notFound if there is no transparent pixel.
+    size_t m_transparentPixel; // Index of transparent pixel. Value is kNotFound if there is no transparent pixel.
     WebCore::ImageFrame::DisposalMethod m_disposalMethod; // Restore to background, leave in place, etc.
     int m_dataSize;
 
     bool m_progressiveDisplay; // If true, do Haeberli interlace hack.
     bool m_interlaced; // True, if scanlines arrive interlaced order.
 
     unsigned m_delayTime; // Display time, in milliseconds, for this image in a multi-image GIF.
 
     OwnPtr<GIFLZWContext> m_lzwContext;
     Vector<GIFLZWBlock> m_lzwBlocks; // LZW blocks for this frame.
@@ skipping 86 matching lines @@
     GIFColorMap m_globalColorMap;
     int m_loopCount; // Netscape specific extension block to control the number of animation loops a GIF renders.
 
     Vector<OwnPtr<GIFFrameContext> > m_frames;
 
     RefPtr<WebCore::SharedBuffer> m_data;
     bool m_parseCompleted;
 };
 
 #endif