mac: Make crypto_unittests depend on nspr

crypto/crypto.gyp

 # Copyright (c) 2012 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 244 matching lines @@
           'sources!': [
             'rsa_private_key_nss_unittest.cc',
             'openpgp_symmetric_encryption_unittest.cc',
           ]
         }],
         [ 'OS == "mac" or OS == "win"', {
           'dependencies': [
             '../third_party/nss/nss.gyp:nss',
           ],
         }],
+        [ 'OS == "mac"', {
+          'dependencies': [
+            '../third_party/nss/nss.gyp:nspr',
+          ],
+        }],
         [ 'use_openssl==1', {
           'sources!': [
             'nss_util_unittest.cc',
             'openpgp_symmetric_encryption_unittest.cc',
             'rsa_private_key_nss_unittest.cc',
           ],
         }],
       ],
     },
   ],
 }