7 files declare their use of ViewsConfigUpdater

block_content.post_update.php in core/modules/block_content/block_content.post_update.php
Post update functions for Content Block.
system.post_update.php in core/modules/system/system.post_update.php
Post update functions for System.
views.post_update.php in core/modules/views/views.post_update.php
Post update functions for Views.
ViewsConfigUpdaterTest.php in core/modules/views/tests/src/Kernel/ViewsConfigUpdaterTest.php
ViewsHooks.php in core/modules/views/src/Hook/ViewsHooks.php
ViewsTestConfigUpdaterHooks.php in core/modules/views/tests/modules/views_test_config_updater/src/Hook/ViewsTestConfigUpdaterHooks.php
views_test_config_updater.post_update.php in core/modules/views/tests/modules/views_test_config_updater/views_test_config_updater.post_update.php

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