Bug 962449 - Don't call initIteratorClasses directly, and use ensureConstructor. r=luke This isn't strictly necessary at this point. The basic issue is that there are a few new classes (iterator stuff, intl stuff, and typed objects) that use this kind of constructor bootstrap scheme, and each of them will need something like this to move to ClassSpecs. But that doesn't actually need to happen until we convert them. I wrote this patch before I realized this, and I believe it's correct, so I figured I'd get it landed along with everything. But I'm also ok to skip it for now.

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