Re: [heycam/webidl] Review handling of WindowProxy (#656)

> What is the reason that "implements" and "is a platform object" need to deal with WindowProxy?

Here's a simple example.  Let's say I do:
```
  window.addEventListener("foo", () => {});
```
What should happen?  When `addEventListener` is called we land in the steps defined in https://heycam.github.io/webidl/#dfn-create-operation-function step 2.1.  In step 2.1.2.4, _O_ is the WindowProxy.  So as currently written that check will fail, since a WindowProxy tests false for "is a platform object".  That's not the behavior we want.

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