Update NSS to 3.21 RTM and NSPR to 4.11 RTM

scripts/nss-checkout.sh

 #!/bin/sh
 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This shell script checks out the NSS source tree from hg and prepares
 # it for Chromium.
 
 # Make the script exit as soon as something fails.
 set -ex
 
 # We only need the nss/lib directory, but hg requires us to check out the
 # complete nss source tree.
 rm -rf nss
-hg clone -u NSS_3_19_RTM https://hg.mozilla.org/projects/nss
+hg clone -u NSS_3_21_RTM https://hg.mozilla.org/projects/nss
 
 # Rename one of the utf8.c files to avoid name conflict.
 mv nss/lib/base/utf8.c nss/lib/base/nssutf8.c
 
 rm -r nss/lib/ckfw/capi
 rm -r nss/lib/ckfw/dbm
 rm -r nss/lib/ckfw/nssmkey
 rm -r nss/lib/crmf
 rm -r nss/lib/dbm
 rm -r nss/lib/freebl/ecl/tests
@@ skipping 61 matching lines @@
     ! -name mp_gf2m-priv.h ! -name mp_gf2m.c ! -name mp_gf2m.h \
     ! -name primes.c ! -name pqg.c ! -name pqg.h ! -name rawhash.c \
     ! -name rijndael.c ! -name rijndael.h ! -name rijndael32.tab \
     ! -name rsa.c ! -name rsapkcs.c ! -name secmpi.h \
     ! -name secrng.h ! -name seed.c ! -name seed.h \
     ! -name sha256.h ! -name sha512.c ! -name sha_fast.c \
     ! -name sha_fast.h ! -name shsign.h ! -name shvfy.c \
     ! -name sysrand.c ! -name tlsprfalg.c ! -name unix_rand.c \
     ! -name win_rand.c \
     | xargs rm