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

chrome/browser/sync/glue/extension_data_type_controller.h

Index: chrome/browser/sync/glue/extension_data_type_controller.h
diff --git a/chrome/browser/sync/glue/extension_data_type_controller.h b/chrome/browser/sync/glue/extension_data_type_controller.h
index b057d0752190939a41c96dae30c544d2c00825d3..2fa9f9231d5f1932d18470f23d6e3cac4c0322f2 100644
--- a/chrome/browser/sync/glue/extension_data_type_controller.h
+++ b/chrome/browser/sync/glue/extension_data_type_controller.h
@@ -22,13 +22,12 @@ class ExtensionDataTypeController : public sync_driver::UIDataTypeController {
  public:
   ExtensionDataTypeController(
       syncer::ModelType type,  // Either EXTENSIONS or APPS.
-      const base::Closure& error_callback,
+      const base::Closure& dump_stack,
       sync_driver::SyncClient* sync_client,
       Profile* profile);
-
- private:
   ~ExtensionDataTypeController() override;
 
+ private:
   // DataTypeController implementations.
   bool StartModels() override;