Make USE_OPENSSL and USE_NSS mutually exclusive

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'base.gypi',
@@ skipping 209 matching lines @@
             'event_trace_consumer_win_unittest.cc',
             'event_trace_controller_win_unittest.cc',
             'event_trace_provider_win_unittest.cc',
             'object_watcher_unittest.cc',
             'system_monitor_unittest.cc',
             'time_win_unittest.cc',
             'trace_event_win_unittest.cc',
             'win_util_unittest.cc',
           ],
         }],
+        [ 'use_openssl==1', {
+          'sources!': [
+            'crypto/rsa_private_key_nss_unittest.cc',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'test_support_base',
       'type': '<(library)',
       'dependencies': [
         'base',
         'base_i18n',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
@@ skipping 72 matching lines @@
       ],
     }],
   ],
 }
 
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