Re: [permissions] Remove global variables (#35)

As an example, `query()` invokes "create" in step 4 and passes it two variables yet "create" only accepts one. Since the first argument "create" accepts is a permission and it is passed a global object this would likely crash if I were to attempt to implement this.

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https://github.com/w3c/permissions/issues/35#issuecomment-99530268