ui: Cleanup class/struct forward declarations

services/device/device_service.cc

Index: services/device/device_service.cc
diff --git a/services/device/device_service.cc b/services/device/device_service.cc
index 9bb17ce0dea4ee1ea30eb6f73d437f3bd39f7548..acf5f7b6c4a85dcb32a1cecd23b64228cd123342 100644
--- a/services/device/device_service.cc
+++ b/services/device/device_service.cc
@@ -12,8 +12,7 @@
 namespace device {
 
 std::unique_ptr<service_manager::Service> CreateDeviceService(
-    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
-    const base::Closure& quit_closure) {
+    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) {
   return base::MakeUnique<DeviceService>(std::move(file_task_runner));
 }