Clean up threading model of external extension providers

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 1182 matching lines @@
         'browser/extensions/extension_webnavigation_api_constants.cc',
         'browser/extensions/extension_webnavigation_api_constants.h',
         'browser/extensions/extension_webstore_private_api.cc',
         'browser/extensions/extension_webstore_private_api.h',
         'browser/extensions/extensions_quota_service.cc',
         'browser/extensions/extensions_quota_service.h',
         'browser/extensions/extensions_startup.cc',
         'browser/extensions/extensions_startup.h',
         'browser/extensions/extensions_ui.cc',
         'browser/extensions/extensions_ui.h',
-        'browser/extensions/external_extension_provider.h',
-        'browser/extensions/external_pref_extension_provider.cc',
-        'browser/extensions/external_pref_extension_provider.h',
-        'browser/extensions/external_policy_extension_provider.cc',
-        'browser/extensions/external_policy_extension_provider.h',
-        'browser/extensions/external_registry_extension_provider_win.cc',
-        'browser/extensions/external_registry_extension_provider_win.h',
+        'browser/extensions/external_extension_provider_interface.h',
+        'browser/extensions/external_extension_provider_impl.cc',
+        'browser/extensions/external_extension_provider_impl.h',
+        'browser/extensions/external_extension_loader.cc',
+        'browser/extensions/external_extension_loader.h',
+        'browser/extensions/external_pref_extension_loader.cc',
+        'browser/extensions/external_pref_extension_loader.h',
+        'browser/extensions/external_policy_extension_loader.cc',
+        'browser/extensions/external_policy_extension_loader.h',
+        'browser/extensions/external_registry_extension_loader_win.cc',
+        'browser/extensions/external_registry_extension_loader_win.h',
         'browser/extensions/file_reader.cc',
         'browser/extensions/file_reader.h',
         'browser/extensions/gtk_theme_installed_infobar_delegate.cc',
         'browser/extensions/gtk_theme_installed_infobar_delegate.h',
         'browser/extensions/image_loading_tracker.cc',
         'browser/extensions/image_loading_tracker.h',
         'browser/extensions/pack_extension_job.cc',
         'browser/extensions/pack_extension_job.h',
         'browser/extensions/sandboxed_extension_unpacker.cc',
         'browser/extensions/sandboxed_extension_unpacker.h',
-        'browser/extensions/stateful_external_extension_provider.cc',
-        'browser/extensions/stateful_external_extension_provider.h',
         'browser/extensions/theme_installed_infobar_delegate.cc',
         'browser/extensions/theme_installed_infobar_delegate.h',
         'browser/extensions/user_script_listener.cc',
         'browser/extensions/user_script_listener.h',
         'browser/extensions/user_script_master.cc',
         'browser/extensions/user_script_master.h',
         'browser/external_protocol_handler.cc',
         'browser/external_protocol_handler.h',
         'browser/external_tab_container_win.cc',
         'browser/external_tab_container_win.h',
@@ skipping 3305 matching lines @@
       ],
     },
   ],
 }
 
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