Clean up threading model of external extension providers

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1157 matching lines @@
         'browser/extensions/extension_menu_manager_unittest.cc',
         'browser/extensions/extension_prefs_unittest.cc',
         'browser/extensions/extension_process_manager_unittest.cc',
         'browser/extensions/extension_omnibox_unittest.cc',
         'browser/extensions/extension_service_unittest.cc',
         'browser/extensions/extension_service_unittest.h',
         'browser/extensions/extension_ui_unittest.cc',
         'browser/extensions/extension_updater_unittest.cc',
         'browser/extensions/extension_webnavigation_unittest.cc',
         'browser/extensions/extensions_quota_service_unittest.cc',
-        'browser/extensions/external_policy_extension_provider_unittest.cc',
+        'browser/extensions/external_policy_extension_loader_unittest.cc',
         'browser/extensions/file_reader_unittest.cc',
         'browser/extensions/image_loading_tracker_unittest.cc',
         'browser/extensions/sandboxed_extension_unpacker_unittest.cc',
         'browser/extensions/user_script_listener_unittest.cc',
         'browser/extensions/user_script_master_unittest.cc',
         'browser/first_run/first_run_unittest.cc',
         'browser/geolocation/device_data_provider_unittest.cc',
         'browser/geolocation/fake_access_token_store.h',
         'browser/geolocation/gateway_data_provider_common_unittest.cc',
         'browser/geolocation/geolocation_content_settings_map_unittest.cc',
@@ skipping 2450 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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