15 files declare their use of StreamWrapperManagerInterface

FileCopy.php in core/modules/migrate/src/Plugin/migrate/process/FileCopy.php
FileCopyTest.php in core/modules/migrate/tests/src/Unit/process/FileCopyTest.php
FileDownloadController.php in core/modules/system/src/FileDownloadController.php
FileSystem.php in core/lib/Drupal/Core/File/FileSystem.php
FileSystemForm.php in core/modules/system/src/Form/FileSystemForm.php
FileSystemTest.php in core/tests/Drupal/Tests/Core/File/FileSystemTest.php
GDToolkit.php in core/modules/system/src/Plugin/ImageToolkit/GDToolkit.php
HtaccessWriter.php in core/lib/Drupal/Core/File/HtaccessWriter.php
ImageStyleDownloadController.php in core/modules/image/src/Controller/ImageStyleDownloadController.php
ImageStyleRoutes.php in core/modules/image/src/Routing/ImageStyleRoutes.php
LibraryDiscoveryParser.php in core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
LibraryDiscoveryParserTest.php in core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
Contains \Drupal\Tests\Core\Asset\LibraryDiscoveryParserTest.
MimeTypeGuesser.php in core/lib/Drupal/Core/File/MimeType/MimeTypeGuesser.php
PathProcessorImageStyles.php in core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
SaveDataTest.php in core/modules/file/tests/src/Kernel/SaveDataTest.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.