Re: [whatwg/webidl] Replaceable attribute `window.performance` (Issue #1193)

> ```js
> window. hasOwnProperty('performance'); // => true, should be false according to the definition.
> ```

Interface members for interface marked with `[Global]` are properties on the instance object instead of on the interface prototype object. (see https://webidl.spec.whatwg.org/#es-attributes and step 10 in https://webidl.spec.whatwg.org/#es-platform-objects). `[Replaceable]` really only changes the behaviour of the attribute's setter (see step 4.5.5 in https://webidl.spec.whatwg.org/#dfn-attribute-setter).

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