Fix to larryh's earlier checkin to implement bug #17558. Previous fix from bad diff would always result in an error trying to create a file that already existed (should only be an error in certain cases). r=sfraser
Fix to larryh's earlier checkin to implement bug #17558. Previous fix from bad diff would always result in an error trying to create a file that already existed (should only be an error in certain cases). r=sfraser

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub