Re: [webidl] Add a [SecureContext] operator attribute (#65)

@travisleithead, I don't think that we can completely prevent the workarounds in secure contexts, but that's a problem for @mikewest to solve over on w3c/webappsec-secure-contexts.  WebIDL need only consume the results of that work, which doesn't necessarily require any judgment about whether secure contexts is good or bad (of course I'd prefer good, but recognize how hard it is to get this right). 

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