The tabs are still there even if you miss the prompt. Either press Ctrl-Shift-T, or select the three dots => History and the tabs are there, under the "Recently closed" section. The caveat is that you have to restore the tabs before you've browsed enough pages that the tabs are pushed out of the recently closed tabs. Also, I simulate Chrome crashing by sending SIGSEGV signal to it, but I'm pretty sure this applies even if Chrome crashes for real.