Well, it's related in the sense that we need the isolate further down below.  I thought I'd fix up the HandleScope while I'm here, saves work if/when node grows multi-isolate support.  I can back it out if you want.

I'm not going to fix up all the HandleScopes in the file however, I'm strictly working on a scratch-my-own-itch basis.  (Or scratch-a-user-itch as is the case here.)