[Sync] Convert DTCs to be not RefCounted and NonThreadSafe.

chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h

Index: chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
diff --git a/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h b/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
index e665d1abdb14fbe671781981a171a0283621b076..9f6c9b7c9b5a3b204e22d7c3fb60d4b75ef85c95 100644
--- a/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
+++ b/chrome/browser/ui/app_list/arc/arc_package_sync_data_type_controller.h
@@ -21,17 +21,16 @@ class Profile;
 class ArcPackageSyncDataTypeController
     : public sync_driver::UIDataTypeController {
  public:
+  // |dump_stack| is called when an unrecoverable error occurs.
   ArcPackageSyncDataTypeController(syncer::ModelType type,
-                                   const base::Closure& error_callback,
+                                   const base::Closure& dump_stack,
                                    sync_driver::SyncClient* sync_client,
                                    Profile* profile);
+  ~ArcPackageSyncDataTypeController() override;
 
   bool ReadyForStart() const override;
 
  private:
-  // DataTypeController is RefCounted.
-  ~ArcPackageSyncDataTypeController() override;
-
   void OnArcAppsSyncPrefChanged();
 
   void OnArcEnabledPrefChanged();