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

Source/core/css/RuleSet.cpp

Index: Source/core/css/RuleSet.cpp
diff --git a/Source/core/css/RuleSet.cpp b/Source/core/css/RuleSet.cpp
index 2ffda78c0c6b383e914e434ce39743c7f0a64836..87fd2dc3ea764391058277c04667ab67d5e39acd 100644
--- a/Source/core/css/RuleSet.cpp
+++ b/Source/core/css/RuleSet.cpp
@@ -359,7 +359,7 @@ void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase> >& rules, const M
             StyleRule* styleRule = static_cast<StyleRule*>(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)) {
                     if (isDocumentScope(scope))
                         continue;
@@ -423,7 +423,7 @@ void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvalu
 
 void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
 {
-    for (size_t selectorIndex = 0; selectorIndex != notFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
+    for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
         addRule(rule, selectorIndex, addRuleFlags);
 }