Well, I followed your directions to the t, including the whole "highest priority" thing. It didn't work for me in terms of closing my currently open Chrome windows and restarting them. Maybe it wasn't intended to though, maybe your script is only intended to work for when the computer restarts and when chrome autostarts itself, or something like that. So, I closed it down again and added @Pjertan's bit to it:
That worked when I restarted it myself (from my own shortcut that I re-added to the task bar).
UNFORTUNATELY FOR ME (my fault), I lost ALL my tabs from all my other windows that were open. I had literally hundreds of tabs that I was "going to get to later"... but now they're all closed. That's quite disappointing. I would've thought Chrome would keep them in the "recently closed" menu even if it was from two "close windows" and restarts prior. Clearly I was wrong. :-( Well, I suppose that's one way of clearing up having too many tabs open. Ah well.