src/vs/workbench/services/integrity/electron-sandbox/integrityService.ts/IntegrityStorage/_read
class IntegrityStorage:	private _read(): IStorageData | null {
		let jsonValue = this.storageService.get(IntegrityStorage.KEY, StorageScope.GLOBAL);
		if (!jsonValue) {
			return null;
		}
		try {
			return JSON.parse(jsonValue);
		} catch (err) {
			return null;
		}
	}