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

chrome/browser/sync/glue/extension_setting_data_type_controller.h

Index: chrome/browser/sync/glue/extension_setting_data_type_controller.h
diff --git a/chrome/browser/sync/glue/extension_setting_data_type_controller.h b/chrome/browser/sync/glue/extension_setting_data_type_controller.h
index 9f8e7d8aac36db6befca3e371b7f77bfc892dffb..fec08faf91718ee55da924e4ad489d31496dfcc6 100644
--- a/chrome/browser/sync/glue/extension_setting_data_type_controller.h
+++ b/chrome/browser/sync/glue/extension_setting_data_type_controller.h
@@ -29,25 +29,20 @@ class ExtensionSettingDataTypeController
   ExtensionSettingDataTypeController(
       // Either EXTENSION_SETTINGS or APP_SETTINGS.
       syncer::ModelType type,
-      const base::Closure& error_callback,
+      const base::Closure& dump_stack,
       sync_driver::SyncClient* sync_client,
       Profile* profile);
+  ~ExtensionSettingDataTypeController() override;
 
   // NonFrontendDataTypeController implementation
-  syncer::ModelType type() const override;
   syncer::ModelSafeGroup model_safe_group() const override;
 
  private:
-  ~ExtensionSettingDataTypeController() override;
-
   // NonFrontendDataTypeController implementation.
   bool PostTaskOnBackendThread(const tracked_objects::Location& from_here,
                                const base::Closure& task) override;
   bool StartModels() override;
 
-  // Either EXTENSION_SETTINGS or APP_SETTINGS.
-  syncer::ModelType type_;
-
   // Only used on the UI thread.
   Profile* profile_;