src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts/AbstractTaskService/removePersistentTask
class AbstractTaskService:	public removePersistentTask(key: string) {
		if (this._getTasksFromStorage('persistent').has(key)) {
			this._getTasksFromStorage('persistent').delete(key);
			this._savePersistentTasks();
		}
	}