Enable use_once_callback for //content/common/*.mojom

content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h

Index: content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h
diff --git a/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h b/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h
index 531427ea9b5a7550baf571e6c56cbd733cc7ee8f..07abed7164c4ee6e6d32bd4dd9f8768991890475 100644
--- a/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h
+++ b/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.h
@@ -63,23 +63,23 @@ class BackgroundFetchEmbeddedWorkerTestHelper
   // EmbeddedWorkerTestHelper overrides:
   void OnBackgroundFetchAbortEvent(
       const std::string& tag,
-      const mojom::ServiceWorkerEventDispatcher::
-          DispatchBackgroundFetchAbortEventCallback& callback) override;
+      mojom::ServiceWorkerEventDispatcher::
+          DispatchBackgroundFetchAbortEventCallback callback) override;
   void OnBackgroundFetchClickEvent(
       const std::string& tag,
       mojom::BackgroundFetchState state,
-      const mojom::ServiceWorkerEventDispatcher::
-          DispatchBackgroundFetchClickEventCallback& callback) override;
+      mojom::ServiceWorkerEventDispatcher::
+          DispatchBackgroundFetchClickEventCallback callback) override;
   void OnBackgroundFetchFailEvent(
       const std::string& tag,
       const std::vector<BackgroundFetchSettledFetch>& fetches,
-      const mojom::ServiceWorkerEventDispatcher::
-          DispatchBackgroundFetchFailEventCallback& callback) override;
+      mojom::ServiceWorkerEventDispatcher::
+          DispatchBackgroundFetchFailEventCallback callback) override;
   void OnBackgroundFetchedEvent(
       const std::string& tag,
       const std::vector<BackgroundFetchSettledFetch>& fetches,
-      const mojom::ServiceWorkerEventDispatcher::
-          DispatchBackgroundFetchedEventCallback& callback) override;
+      mojom::ServiceWorkerEventDispatcher::
+          DispatchBackgroundFetchedEventCallback callback) override;
 
  private:
   bool fail_abort_event_ = false;