9 files declare their use of RestResourceConfig

ConfigDependenciesTest.php in core/modules/rest/tests/src/Kernel/Entity/ConfigDependenciesTest.php
ContentModerationStateResourceTest.php in core/modules/content_moderation/tests/src/Kernel/ContentModerationStateResourceTest.php
ResourceTest.php in core/modules/rest/tests/src/Functional/ResourceTest.php
ResponseGeneratorTest.php in core/modules/system/tests/src/Functional/System/ResponseGeneratorTest.php
rest.post_update.php in core/modules/rest/rest.post_update.php
Post update functions for Rest.
RestResourceConfigResourceTestBase.php in core/modules/rest/tests/src/Functional/Rest/RestResourceConfigResourceTestBase.php
RestResourceConfigTest.php in core/modules/jsonapi/tests/src/Functional/RestResourceConfigTest.php
RestResourceConfigTest.php in core/modules/rest/tests/src/Unit/Entity/RestResourceConfigTest.php
RestResourceConfigTest.php in core/modules/rest/tests/src/Kernel/Entity/RestResourceConfigTest.php

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