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

Source/core/platform/graphics/BitmapImage.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple 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
@@ skipping 96 matching lines @@
 
 void BitmapImage::destroyDecodedData(bool destroyAll)
 {
     for (size_t i = 0; i < m_frames.size(); ++i) {
         // The underlying frame isn't actually changing (we're just trying to
         // save the memory for the framebuffer data), so we don't need to clear
         // the metadata.
         m_frames[i].clear(false);
     }
 
-    destroyMetadataAndNotify(m_source.clearCacheExceptFrame(destroyAll ? notFound : m_currentFrame));
+    destroyMetadataAndNotify(m_source.clearCacheExceptFrame(destroyAll ? kNotFound : m_currentFrame));
 }
 
 void BitmapImage::destroyDecodedDataIfNecessary()
 {
     // Animated images >5MB are considered large enough that we'll only hang on
     // to one frame at a time.
     static const size_t cLargeAnimationCutoff = 5242880;
     size_t allFrameBytes = 0;
     for (size_t i = 0; i < m_frames.size(); ++i)
         allFrameBytes += m_frames[i].m_frameBytes;
@@ skipping 517 matching lines @@
     }
     return m_isSolidColor && !m_currentFrame;
 }
 
 Color BitmapImage::solidColor() const
 {
     return m_solidColor;
 }
 
 }