8274237: Replace 'for' cycles with iterator with enhanced-for in java.base

Reviewed-by: dfuchs, weijun

src/java.base/share/classes/java/security/Security.java

@@ -622,8 +622,7 @@ public final class Security {
 
         // For each selection criterion, remove providers
         // which don't satisfy the criterion from the candidate set.
-        for (Iterator<String> ite = keySet.iterator(); ite.hasNext(); ) {
-            String key = ite.next();
+        for (String key : keySet) {
             String value = filter.get(key);
 
             LinkedHashSet<Provider> newCandidates = getAllQualifyingCandidates(key, value,