IDBDatabase.createMutableFile() is deprecated. If this API gets standardized, it will likely do so under the Origin Private File System effort at https://bugzil.la/1748667.
IDBDatabase.createMutableFile() 已弃用。若此 API 得到标准化，可能是在 https://bugzil.la/1748667 的 Origin Private File System 下实现。