8296142: CertAttrSet::(getName|getElements|delete) are mostly useless

Reviewed-by: mullan

src/java.base/share/classes/sun/security/x509/CertificatePoliciesExtension.java

@@ -218,34 +218,12 @@ implements CertAttrSet<String> {
         }
     }
 
-    /**
-     * Delete the attribute value.
-     */
-    public void delete(String name) throws IOException {
-        if (name.equalsIgnoreCase(POLICIES)) {
-            certPolicies = null;
-        } else {
-          throw new IOException("Attribute name [" + name +
-                                "] not recognized by " +
-                                "CertAttrSet:CertificatePoliciesExtension.");
-        }
-        encodeThis();
-    }
 
-    /**
-     * Return an enumeration of names of attributes existing within this
-     * attribute.
-     */
-    public Enumeration<String> getElements() {
-        AttributeNameEnumeration elements = new AttributeNameEnumeration();
-        elements.addElement(POLICIES);
-
-        return (elements.elements());
-    }
 
     /**
      * Return the name of this attribute.
      */
+    @Override
     public String getName() {
         return (NAME);
     }