Bug 845021: Add size_t cast in assertion, to silence build warning, in ObjectWrapperChild::AnswerNewEnumerateNext. r=Waldo
Fix for bug 844559 (Crash [@ mozilla::dom::XrayResolveNativeProperty]). r=bz.

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extra : rebase_source : 85b3d0ee270f24847b9425cda9f8b56a494f2546