Bug 1774467: Fixed bug where premature shutdown of dedicated worker could lead to browser crash. r=dom-storage-reviewers,asuth

Differential Revision: https://phabricator.services.mozilla.com/D151288

dom/quota/StorageManager.cpp

@@ -360,6 +360,7 @@ already_AddRefed<Promise> ExecuteOpOnMainOrWorkerThread(
   RefPtr<PromiseWorkerProxy> promiseProxy =
       PromiseWorkerProxy::Create(workerPrivate, promise);
   if (NS_WARN_IF(!promiseProxy)) {
+    aRv.Throw(NS_ERROR_FAILURE);
     return nullptr;
   }