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

@martinthomson That makes a lot of sense, though it doesn't prevent the insecure context from using a new window to broker its access to the features not present--though perhaps that can be solved in a different way as noted in https://github.com/w3c/webappsec-secure-contexts/issues/6#issuecomment-151340965

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