Re: [csswg-drafts] [resize-observer] Which box information should we pass to the callback (#3329)

To summarize the above - is to go with Option B with the removal of scrollBox - and taking into account fragments of course - so the shape will now look like this:

```
entry = {
        target: <Element>,
        contentRect: {/* v1 for back compat */},
        contentBox: null,
        borderBox: [{
            inline: 400,
            block: 400
        }]
    }
```

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