fix: Remove unused static var and method in files application

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

apps/files/lib/App.php

@@ -7,43 +7,9 @@
  */
 namespace OCA\Files;
 
-use OC\NavigationManager;
 use OCA\Files\Service\ChunkedUploadConfig;
-use OCP\App\IAppManager;
-use OCP\EventDispatcher\IEventDispatcher;
-use OCP\IConfig;
-use OCP\IGroupManager;
-use OCP\INavigationManager;
-use OCP\IURLGenerator;
-use OCP\IUserSession;
-use OCP\L10N\IFactory;
-use OCP\Server;
-use Psr\Log\LoggerInterface;
 
 class App {
-	private static ?INavigationManager $navigationManager = null;
-
-	/**
-	 * Returns the app's navigation manager
-	 */
-	public static function getNavigationManager(): INavigationManager {
-		// TODO: move this into a service in the Application class
-		if (self::$navigationManager === null) {
-			self::$navigationManager = new NavigationManager(
-				Server::get(IAppManager::class),
-				Server::get(IUrlGenerator::class),
-				Server::get(IFactory::class),
-				Server::get(IUserSession::class),
-				Server::get(IGroupManager::class),
-				Server::get(IConfig::class),
-				Server::get(LoggerInterface::class),
-				Server::get(IEventDispatcher::class),
-			);
-			self::$navigationManager->clear(false);
-		}
-		return self::$navigationManager;
-	}
-
 	public static function extendJsConfig($settings): void {
 		$appConfig = json_decode($settings['array']['oc_appconfig'], true);