Re: [webcomponents] Replace getDistributedNodes with getAssignedNodes (#322)

How does FrozenArray work given the list of assigned nodes change over time?  An array is either frozen or not frozen.  We shouldn't be modifying a frozen array magically under the hood.  If we're creating a new array on that attribute, then it's always O(n) regardless of whether it's a method or an attribute since we have to create a new array on each access.

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