Re: [heycam/webidl] Promise handling algorithms are not very clear about what happens if type conversion fails (#782)

Gecko pays attention to the _T_ in the following ways:

1) IDL parse fails if `Promise<T>` is the return type of an operation or attribute but _T_ is not exposed in all the globals where the operation or attribute is exposed.  There is no corresponding requirement in the spec, as far as I can tell (also for the situation where some type is returned directly, without Promise being involved), but fundamentally it doesn't make sense to have this setup.
2) Something involving which C++ headers to include in generated binding files.  I'm not even convinced that code needs to be there.

There are no other places that are aware of the _T_ in Gecko as far as I can tell.

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