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Two function-scoped typedefs that are no longer used are removed by this trivial pull request. They were inadvertently left behind when the code using them was removed more than a year ago.
The typedefs are actually harmful, because if PileUpEventPrincipal::getByLabel() is called for a type that is not a collection (e.g. HepMCProduct), the call will not compile, as the typdefs are not defined.