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

OK thanks @bzbarsky for explaining those. I now understand that the call to the getter happens during the IDL processing (converting a JavaScript Object to a `ShareData` value), before any of the Web Share algorithm steps take place, and thus the order of the steps is irrelevant. Therefore, my points 2–5 are invalid, and this is actually a much better reflection of whether the `files` attribute exists in the implementation's IDL dictionary than I had previously thought.

I still stand by points 1 and 6. This is still relying on URL processing to reject before `share` has any side effects.

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