Feedback from https://github.com/WebKit/WebKit/pull/6765. Use "nonnegative" rather than "non-negative" or "NonNegative" consistently. Let's do this all at once.
One mark against doing this is that the HTML spec uses "non-negative" and some of our code is referencing that: https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#rules-for-parsing-non-negative-integers
We can take our lead from that if you like; I am OK with that. I had looked in a dictionary instead. Multiple dictionaries seem to agree that itβs a word and needs no hyphen.
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