Bug 1046282 part 1: Make Create*Decoder function-signatures use a consistent style. r=rillian
Bug 1046282 part 2: Drop unnecessary else-after-return in EMEDecoderModule.cpp. r=rillian
Bug 1046282 part 3: Use nsRefPtr instead of RefPtr for DecoderData::mDecoder (and mTaskQueue, for consistency & good measure). r=rillian r=cpearce
Bug 1046282 part 4: Make Create*Decoder functions return already_AddRefed. r=rillian