8266459: Implement JEP 411: Deprecate the Security Manager for Removal

Co-authored-by: Sean Mullan <mullan@openjdk.org>
Co-authored-by: Lance Andersen <lancea@openjdk.org>
Co-authored-by: Weijun Wang <weijun@openjdk.org>
Reviewed-by: erikj, darcy, chegar, naoto, joehw, alanb, mchung, kcr, prr, lancea

src/java.base/share/classes/sun/security/ssl/AlpnExtension.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -66,6 +66,7 @@ final class AlpnExtension {
     static final Charset alpnCharset;
 
     static {
+        @SuppressWarnings("removal")
         String alpnCharsetString = AccessController.doPrivileged(
                 (PrivilegedAction<String>) ()
                         -> Security.getProperty("jdk.tls.alpnCharset"));