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https://dom.spec.whatwg.org/#interface-nodeiterator Usage is as low as it gets: https://www.chromestatus.com/metrics/feature/timeline/popularity/347 Unless there's some argument from consistency with Range.detach(), which is used: https://www.chromestatus.com/metrics/feature/timeline/popularity/372
Fine with me to remove it. Do you want to lead in implementation?
Today I spent some time helping people deal with breakage after the removal of another rarely used function in https://code.google.com/p/chromium/issues/detail?id=434976 so I'm feeling less bold about this. If someone else moves first I'd be happy to kill this in Blink as well, but otherwise I'll save my trouble-making for non-standard stuff and stuff that enables simplification.