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

Source/core/css/StyleInvalidationAnalysis.cpp

 /*
  * Copyright (C) 2012 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 62 matching lines @@
 static bool hasDistributedRule(StyleSheetContents* styleSheetContents)
 {
     const Vector<RefPtr<StyleRuleBase> >& rules = styleSheetContents->childRules();
     for (unsigned i = 0; i < rules.size(); i++) {
         const StyleRuleBase* rule = rules[i].get();
         if (!rule->isStyleRule())
             continue;
 
         const StyleRule* styleRule = toStyleRule(rule);
         const CSSSelectorList& selectorList = styleRule->selectorList();
-        for (size_t selectorIndex = 0; selectorIndex != notFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
+        for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
             if (selectorList.hasShadowDistributedAt(selectorIndex))
                 return true;
         }
     }
     return false;
 }
 
 static bool hasAtHostRule(StyleSheetContents* styleSheetContents)
 {
     const Vector<RefPtr<StyleRuleBase> >& rules = styleSheetContents->childRules();
@@ skipping 94 matching lines @@
             element->setNeedsStyleRecalc();
             // The whole subtree is now invalidated, we can skip to the next sibling.
             element = ElementTraversal::nextSkippingChildren(element);
             continue;
         }
         element = ElementTraversal::next(element);
     }
 }
 
 }