Re: [streams] Should ReadableStreamController be visible? (#322)

Maybe your concern can be addressed in Chrome by specifying [NoInterfaceObject] to the IDLs of `ReadableStreamReader` and `ReadableStreamController`. http://heycam.github.io/webidl/#NoInterfaceObject. Then, they are not exposed on window, though they're still obtainable via `controller.__proto__`.

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https://github.com/whatwg/streams/issues/322#issuecomment-91220908