Remove QuotaExceededError from spec

[AngeloKai]

Remove QuotaExceededError per request by @leshi

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[jyasskin]

@leshi, I thought QuotaExceededError solved (or improved) one problem you pointed out with requiring resident keys: it lets the RP tell the user that their key storage is full. It's true that it's not as precise as one might want, but we can solve that by proposing a more precise error name into WebIDL.

https://w3c.github.io/mediacapture-main/getusermedia.html#overconstrainederror-object has another, more complex, precedent.

Or do you actually think that we should leave this vague for now (as this PR does), and come up with a more solid solution with more time to think?

[jyasskin]

This change looks technically correct (although I haven't double-checked for Bikeshed errors), and I don't have a strong opinion about which error to return in this case.

[AngeloKai]

@jyasskin This seems like a small issue. I prefer not letting this drag out our publication schedule. I'd prefer leaving this vague for now and making it more solid later.

[leshi]

@jyasskin,

I think the SelectionResponse variable was internal anyway. So RP wouldn't learn why things failed.

[AngeloKai]

Given that neither @leshi nor @jyasskin has a strong opinion on this, I will go ahead and merge it then.