Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

Those five cases aren't distinguished in any particular way - the need exists *any time we add to a dictionary*. Most dictionaries won't be expanded, true; they generally get defined once and then never touched again. But *any* dictionary *could* be expanded. Having to recognize which ones have been expanded, and figure out the unique key-testing method that each one has *hopefully* remembered to define for itself as soon as the first editor added to the dictionary, is not a good thing to foist on authors, and not a particularly dependable thing to require spec authors to remember to do.

If we're afraid of putting all the dictionary names on the global, we can always stuff it into a single method that takes a dictionary name and a key name, so there's no chance of future collisions.

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