Localize CSS files in content scripts (but don't localize JS files)....

chrome/chrome_tests.gypi

 # 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' : {
     'browser_tests_sources_views_specific': [
       'browser/extensions/browser_action_test_util_views.cc',
       'browser/views/browser_actions_container_unittest.cc',
     ],
@@ skipping 933 matching lines @@
         'common/process_watcher_unittest.cc',
         'common/property_bag_unittest.cc',
         'common/resource_dispatcher_unittest.cc',
         'common/sandbox_mac_unittest.mm',
         'common/thumbnail_score_unittest.cc',
         'common/time_format_unittest.cc',
         'common/worker_thread_ticker_unittest.cc',
         'common/zip_unittest.cc',
         'renderer/audio_message_filter_unittest.cc',
         'renderer/form_manager_unittest.cc',
+        'renderer/user_script_slave_unittest.cc',
         'renderer/media/audio_renderer_impl_unittest.cc',
         'renderer/extensions/extension_api_json_validity_unittest.cc',
         'renderer/extensions/extension_api_client_unittest.cc',
         'renderer/extensions/json_schema_unittest.cc',
         'renderer/net/render_dns_master_unittest.cc',
         'renderer/net/render_dns_queue_unittest.cc',
         'renderer/paint_aggregator_unittest.cc',
         'renderer/pepper_devices_unittest.cc',
         'renderer/render_process_unittest.cc',
         'renderer/render_thread_unittest.cc',
@@ skipping 1224 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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 # indent-tabs-mode:nil
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