Re: [fetch] Abort fetch upon document unload (#53)

Note that this is not always the case. For example, if it's a prefetch or prerender request, then we want to allow those to proceed. The UA should implement own / custom logic for how long its willing to keep those around, when to cancel, and so on. 

Concrete use case is "reactive prefetch": https://plus.google.com/+IlyaGrigorik/posts/ahSpGgohSDo

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