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

Source/core/editing/TextIterator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov.
  *
  * 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 568 matching lines @@
 
         if (runStart < runEnd) {
             // Handle either a single newline character (which becomes a space),
             // or a run of characters that does not include a newline.
             // This effectively translates newlines to spaces without copying the text.
             if (str[runStart] == '\n') {
                 emitCharacter(' ', m_node, 0, runStart, runStart + 1);
                 m_offset = runStart + 1;
             } else {
                 size_t subrunEnd = str.find('\n', runStart);
-                if (subrunEnd == notFound || subrunEnd > runEnd)
+                if (subrunEnd == kNotFound || subrunEnd > runEnd)
                     subrunEnd = runEnd;
 
                 m_offset = subrunEnd;
                 emitText(m_node, renderer, runStart, subrunEnd);
             }
 
             // If we are doing a subrun that doesn't go to the end of the text box,
             // come back again to finish handling this text box; don't advance to the next one.
             if (static_cast<unsigned>(m_positionEndOffset) < textBoxEnd)
                 return;
@@ skipping 1714 matching lines @@
 
     if (rangeLength != 0 && rangeEnd > docTextPosition) { // rangeEnd is out of bounds
         resultRange->setEnd(textRunRange->endContainer(), textRunRange->endOffset(), IGNORE_EXCEPTION);
     }
 
     return resultRange.release();
 }
 
 bool TextIterator::getLocationAndLengthFromRange(Node* scope, const Range* range, size_t& location, size_t& length)
 {
-    location = notFound;
+    location = kNotFound;
     length = 0;
 
     if (!range->startContainer())
         return false;
 
     // The critical assumption is that this only gets called with ranges that
     // concentrate on a given area containing the selection root. This is done
     // because of text fields and textareas. The DOM for those is not
     // directly in the document DOM, so ensure that the range does not cross a
     // boundary of one of those.
@@ skipping 109 matching lines @@
         if (!matchLength)
             return collapsedToBoundary(range, !(options & Backwards));
     }
 
     // Then, find the document position of the start and the end of the text.
     CharacterIterator computeRangeIterator(range, TextIteratorEntersTextControls);
     return characterSubrange(computeRangeIterator, matchStart, matchLength);
 }
 
 }