Re: [heycam/webidl] Remove disused entries from error names table (2.8.1.) (#946)

> DOMException.DOMSTRING_SIZE_ERR returns 2 for me in Firefox.

That's right, but this PR doesn't suggest removing that constant. What the table (2.8.1.) defines is the mapping from the error name to error code. e.g. `new DOMException('foo', 'DOMStringSizeError').code` should be 2 (=== DOMException.DOMSTRING_SIZE_ERR) according to the table, but `new DOMException('foo', 'DOMStringSizeError').code` is actually 0 in all 4 major browsers.

I checked these mappings (of deprecated ones) by the following expression:
```js
[
  new DOMException('foo', 'IndexSizeError').code,
  new DOMException('foo', 'DOMStringSizeError').code,
  new DOMException('foo', 'ValidationError').code,
  new DOMException('foo', 'InvalidAccessError').code,
  new DOMException('foo', 'NoDataAllowedError').code,
  new DOMException('foo', 'TypeMismatchError').code
]
```
The major 4 browsers all returns `[ 1, 0, 0, 15, 0, 17 ]`, which means they don't implement mapping of `DOMStringSizeError` => 2, `ValidationError` => 6, `NoDataAllowedError` => 16.

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