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

@bifurcation: The more interesting case for the "exposure" method is:

    var thing = navigator.secureOnlyFeature;
    document.domain = document.domain;
    thing.whatever();

I don't know what we'd do in that case; it seems difficult to deal with. Throwing seems to deal with it more cleanly (assuming we're doing runtime checks).

@bzbarsky's note that the prototypes are fixed at load time is (I think) true for V8 as well (@jeisinger to confirm). Removing things based on runtime checks might be difficult to implement.

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