extensions: Abstract out install delay strategy

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 2f507b5e4284a7dae2199fd04e06fe6328996a6d..9745f23e5b63c8b8ddf72e40463eaba0ee316c19 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -207,8 +207,8 @@
       'browser/profiles/profile_info_cache_unittest.h',
       'browser/profiles/profile_manager_unittest.cc',
       'browser/profiles/profile_shortcut_manager_unittest_win.cc',
-      'browser/push_messaging/push_messaging_app_identifier_unittest.cc',
       'browser/push_messaging/background_budget_service_unittest.cc',
+      'browser/push_messaging/push_messaging_app_identifier_unittest.cc',
       'browser/push_messaging/push_messaging_notification_manager_unittest.cc',
       'browser/push_messaging/push_messaging_permission_context_unittest.cc',
       'browser/push_messaging/push_messaging_service_unittest.cc',
@@ -538,6 +538,7 @@
       'browser/extensions/shared_module_service_unittest.cc',
       'browser/extensions/standard_management_policy_provider_unittest.cc',
       'browser/extensions/token_cache/token_cache_service_unittest.cc',
+      'browser/extensions/update_install_gate_unittest.cc',
       'browser/extensions/updater/extension_cache_fake.cc',
       'browser/extensions/updater/extension_cache_fake.h',
       'browser/extensions/updater/extension_updater_unittest.cc',
@@ -1410,8 +1411,8 @@
       'browser/content_settings/content_settings_supervised_provider_unittest.cc',
       'browser/supervised_user/child_accounts/family_info_fetcher_unittest.cc',
       'browser/supervised_user/child_accounts/permission_request_creator_apiary_unittest.cc',
-      'browser/supervised_user/experimental/supervised_user_async_url_checker_unittest.cc',
       'browser/supervised_user/experimental/safe_search_url_reporter_unittest.cc',
+      'browser/supervised_user/experimental/supervised_user_async_url_checker_unittest.cc',
       'browser/supervised_user/supervised_user_bookmarks_handler_unittest.cc',
       'browser/supervised_user/supervised_user_pref_store_unittest.cc',
       'browser/supervised_user/supervised_user_service_unittest.cc',
@@ -1567,11 +1568,11 @@
       'browser/ui/webui/options/language_options_handler_unittest.cc',
       'browser/ui/webui/options/pepper_flash_content_settings_utils_unittest.cc',
       'browser/ui/webui/options/sync_setup_handler_unittest.cc',
-      'browser/ui/webui/settings_utils_unittest.cc',
-      'browser/ui/webui/settings/settings_manage_profile_handler_unittest.cc',
       'browser/ui/webui/settings/people_handler_unittest.cc',
       'browser/ui/webui/settings/reset_settings_handler_unittest.cc',
+      'browser/ui/webui/settings/settings_manage_profile_handler_unittest.cc',
       'browser/ui/webui/settings/site_settings_handler_unittest.cc',
+      'browser/ui/webui/settings_utils_unittest.cc',
       'browser/ui/webui/signin/login_ui_service_unittest.cc',
       'browser/ui/webui/sync_internals_message_handler_unittest.cc',
       'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',