Use webpack worker-loader to load the IndexedDB worker instead of homegrown hack

src/workers/indexeddb.worker.ts

@@ -0,0 +1,21 @@
+/*
+Copyright 2017 Vector Creations Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { IndexedDBStoreWorker } from "matrix-js-sdk/src/indexeddb-worker";
+
+const remoteWorker = new IndexedDBStoreWorker(postMessage as InstanceType<typeof Worker>["postMessage"]);
+
+global.onmessage = remoteWorker.onMessage;