Bug 1065303 - Prepare autocomplete.xml/UnifiedComplete for adding new special result types and heuristics. r=mak

--HG--
extra : transplant_source : %96%27%20FGCQ%D9%B5%FC%8E%CAV%F3%80%5DN%88%0F.
Bug 1067141 - Scratchpad->File->Open File fails to report NS_ERROR_ILLEGAL_INPUT. r=fitzgen