Don't use RSAPrivateKey in NSS integration code.

crypto/crypto.gypi

 # Copyright 2014 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.
 
 {
   'variables': {
     # Put all transitive dependencies for Windows HMAC here.
     # This is required so that we can build them for nacl win64.
     'variables': {
       'hmac_win64_related_sources': [
@@ skipping 49 matching lines @@
       'hmac_openssl.cc',
       'mac_security_services_lock.cc',
       'mac_security_services_lock.h',
       'mock_apple_keychain.cc',
       'mock_apple_keychain.h',
       'mock_apple_keychain_ios.cc',
       'mock_apple_keychain_mac.cc',
       'p224_spake.cc',
       'p224_spake.h',
       'nss_crypto_module_delegate.h',
+      'nss_key_util.cc',
+      'nss_key_util.h',
       'nss_util.cc',
       'nss_util.h',
       'nss_util_internal.h',
       'openssl_bio_string.cc',
       'openssl_bio_string.h',
       'openssl_util.cc',
       'openssl_util.h',
       'p224.cc',
       'p224.h',
       'random.h',
@@ skipping 22 matching lines @@
       'third_party/nss/rsawrapr.c',
       'third_party/nss/secsign.cc',
     ],
     'nacl_win64_sources': [
       '<@(hmac_win64_related_sources)',
       'random.cc',
       'random.h',
     ],
   }
 }