Allow embedders to share code to override UI strings.

components/variations.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/variations
       'target_name': 'variations',
       'type': 'static_library',
@@ skipping 90 matching lines @@
         '../ui/base/ui_base.gyp:ui_base',
         'data_use_measurement_core',
         'metrics',
         'network_time',
         'pref_registry',
         'variations',
         'version_info',
         'web_resource',
       ],
       'sources': [
+        'variations/service/ui_string_overrider.h',
+        'variations/service/ui_string_overrider.cc',
         'variations/service/variations_service.cc',
         'variations/service/variations_service.h',
         'variations/service/variations_service_client.h',
       ],
     },
     {
       # GN version: //components/variations/net:net
       'target_name': 'variations_http_provider',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 40 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'variations',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
     }],
   ]
 }