Sam Atkins ca10fb4129 LibWeb/CSS: Refactor contains_single_none_ident() to actually parse it ...

The new method is Parser::parse_all_as_single_none_value(), which has a
few advantages:

1. There's no need for user code to manually create a StyleValue.
2. It consumes tokens so that doesn't have to be done manually.
3. Whitespace before or after the `none` is consumed correctly.

It does mean we create and then discard a `none` StyleValue in a couple
of places, namely parsing for `grid-*` properties. We may or may not
want to migrate those to returning the IdentifierStyleValue instead.

2024-07-26 11:04:30 +01:00

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