Bug 514280 Stop using nsCOMPtr for concrete types r=bsmedberg

--HG--
extra : rebase_source : f8fb50de9292320eb7589dd28dc566d0f5044da6
Bug 514280 Remove GetIID r=bsmedberg

--HG--
extra : rebase_source : b913300be047e87c24fb95f7bd17793ebd2c5995