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

Source/core/loader/CrossOriginPreflightResultCache.cpp

Index: Source/core/loader/CrossOriginPreflightResultCache.cpp
diff --git a/Source/core/loader/CrossOriginPreflightResultCache.cpp b/Source/core/loader/CrossOriginPreflightResultCache.cpp
index 869076eb8a069e57669f45559fa485e0ccdbc7fe..c3f82abc12e3980cc004cbf88f92876df4e5b5ff 100644
--- a/Source/core/loader/CrossOriginPreflightResultCache.cpp
+++ b/Source/core/loader/CrossOriginPreflightResultCache.cpp
@@ -76,7 +76,7 @@ static bool parseAccessControlAllowList(const String& string, HashSet<String, Ha
 {
     unsigned start = 0;
     size_t end;
-    while ((end = string.find(',', start)) != notFound) {
+    while ((end = string.find(',', start)) != kNotFound) {
         if (start != end)
             addToAccessControlAllowList(string, start, end - 1, set);
         start = end + 1;