Bug 514280 Stop using nsCOMPtr for concrete types r=bsmedberg

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extra : rebase_source : eaca8b2925eaffb49e29a617cd72c0d6686e6d9e
Bug 514280 Remove GetIID r=bsmedberg

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extra : rebase_source : 179d6cd1cfb272ca258b0bc64225b27252c9ffbe