Andreas Kling b2a099e647 LibWeb: Don't leak entire realm after parsing CSS @supports rule ...

Before this change, every CSS @supports rule would keep the containing
JS realm alive via a JS::Handle. This led to a GC reference cycle and
the whole realm leaked.

Since we only need the realm at construction time, we can take it as a
parameter instead, and stop storing it.

2024-04-05 08:14:19 +02:00

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