ui: Cleanup class/struct forward declarations

services/file/file_service.cc

Index: services/file/file_service.cc
diff --git a/services/file/file_service.cc b/services/file/file_service.cc
index 5e7d4711a75111d09a372a69322aa8068fa76dd2..4e844209c4fa270fd82c4fa81f3b2f1cfaf12155 100644
--- a/services/file/file_service.cc
+++ b/services/file/file_service.cc
@@ -73,8 +73,7 @@ class FileService::LevelDBServiceObjects
 
 std::unique_ptr<service_manager::Service> CreateFileService(
     scoped_refptr<base::SingleThreadTaskRunner> file_service_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> leveldb_service_runner,
-    const base::Closure& quit_closure) {
+    scoped_refptr<base::SingleThreadTaskRunner> leveldb_service_runner) {
   return base::MakeUnique<FileService>(std::move(file_service_runner),
                                        std::move(leveldb_service_runner));
 }