Bug 1161627 has landed on inbound, which converts all uses of
mozilla::TemporaryRef to already_AddRefed and removes TemporaryRef.
(already_AddRefed moved to MFBT several months ago, in case you were
wondering about the spreading of XPCOM concepts.)  TemporaryRef was added
for easier porting of code from other engines, but as it has not been used
much for that purpose and it led to somewhat less efficient code in places,
it was deemed a failed experiment.

-Nathan
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