src/vs/workbench/services/workingCopy/common/workingCopyBackupService.ts/WorkingCopyBackupServiceImpl/discardBackup
class WorkingCopyBackupServiceImpl:	discardBackup(identifier: IWorkingCopyIdentifier, token?: CancellationToken): Promise<void> {
		const backupResource = this.toBackupResource(identifier);

		return this.doDiscardBackup(backupResource, token);
	}