6 files declare their use of LocalStream

DummyStreamWrapper.php in core/modules/file/tests/file_test/src/StreamWrapper/DummyStreamWrapper.php
FileCopy.php in core/modules/migrate/src/Plugin/migrate/process/FileCopy.php
ImageTestDummyStreamWrapper.php in core/modules/image/tests/modules/image_module_test/src/StreamWrapper/ImageTestDummyStreamWrapper.php
SiteFilesExcluder.php in core/modules/package_manager/src/PathExcluder/SiteFilesExcluder.php
SystemHooks.php in core/modules/system/src/Hook/SystemHooks.php
TranslationsStream.php in core/modules/locale/src/StreamWrapper/TranslationsStream.php

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