Fix policy_component shared_library link without configuration_policy

components/policy/policy_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
   ],
   'defines': [
     'POLICY_COMPONENT_IMPLEMENTATION',
@@ skipping 185 matching lines @@
       # Chrome can always interface with the PolicyService without having
       # to #ifdef on ENABLE_CONFIGURATION_POLICY.
       'sources': [
         'core/common/external_data_fetcher.h',
         'core/common/external_data_fetcher.cc',
         'core/common/external_data_manager.h',
         'core/common/policy_map.cc',
         'core/common/policy_map.h',
         'core/common/policy_namespace.cc',
         'core/common/policy_namespace.h',
+        'core/common/policy_pref_names.cc',
+        'core/common/policy_pref_names.h',
         'core/common/policy_service.cc',
         'core/common/policy_service.h',
         'core/common/policy_service_stub.cc',
         'core/common/policy_service_stub.h',
       ],
     }],
   ],
 }