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

Source/core/platform/graphics/ImageSource.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 58 matching lines @@
 
     enum GammaAndColorProfileOption {
         GammaAndColorProfileApplied,
         GammaAndColorProfileIgnored
     };
 
     ImageSource(AlphaOption alphaOption = AlphaPremultiplied, GammaAndColorProfileOption gammaAndColorProfileOption = GammaAndColorProfileApplied);
     ~ImageSource();
 
     // Tells the ImageSource that the Image no longer cares about decoded frame
-    // data except for the specified frame. Callers may pass WTF::notFound to
+    // data except for the specified frame. Callers may pass WTF::kNotFound to
     // clear all frames.
     //
     // In response, the ImageSource should delete cached decoded data for other
     // frames where possible to keep memory use low. The expectation is that in
     // the future, the caller may call createFrameAtIndex() with an index larger
     // than the one passed to this function, and the implementation may then
     // make use of the preserved frame data here in decoding that frame.
     // By contrast, callers who call this function and then later ask for an
     // earlier frame may require more work to be done, e.g. redecoding the image
     // from the beginning.
@@ skipping 36 matching lines @@
 private:
     OwnPtr<DeferredImageDecoder> m_decoder;
 
     AlphaOption m_alphaOption;
     GammaAndColorProfileOption m_gammaAndColorProfileOption;
 };
 
 }
 
 #endif