History Main Service: bad reference to 'window'?

This code seems like we could remove it and it was likely never working because `window` is the DOM global `window`:

https://github.com/microsoft/vscode/blob/582b187f88ef40c354d37ee792b621be3fc03a91/src/vs/platform/history/common/historyStorage.ts#L74