Re: [heycam/webidl] Only install @@toStringTag on the prototype (#357)

Chrome is not shipping quite the semantics in this PR, per earlier discussion.  What it's shipping seems to not be documented anywhere.  The web compat data (such as we have; given the amount of browser-sniffing out there, having a single implementation do something is somewhat weak data, sorry) seems to be for what's shipping, not what's in the PR.

My position for Firefox is that no matter what we do _not_ want to change behavior here more than once.  We would want to see the actual proposal showing web compat as much as possible before we can consider it.

> to the extent that `@@toStringTag` makes sense at all

Well, that is the other question, yes.  Do we think `@@toStringTag` is a mechanism worth perpetuating?  Especially if we end up needing some other fallback anyway.

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