Revert "Try putting room list handling behind a lock"

src/utils/MultiLock.ts

@@ -1,30 +0,0 @@
-/*
-Copyright 2021 The Matrix.org Foundation C.I.C.
-
-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 { EnhancedMap } from "./maps";
-import AwaitLock from "await-lock";
-
-export type DoneFn = () => void;
-
-export class MultiLock {
-    private locks = new EnhancedMap<string, AwaitLock>();
-
-    public async acquire(key: string): Promise<DoneFn> {
-        const lock = this.locks.getOrCreate(key, new AwaitLock());
-        await lock.acquireAsync();
-        return () => lock.release();
-    }
-}