bug 809442 - NS_ERROR_FILE_ALREADY_EXISTS error check. r=catlee
bug 809442 - NS_ERROR_FILE_ALREADY_EXISTS error check. r=catlee

armenzg/build-mozharness,kartikgupta0909/gittest,lissyx/build-mozharness,lundjordan/mozharness,kartikgupta0909/mozilla-mozharness,kartikgupta0909/build-mozharness,mozilla/build-mozharness,lundjordan/mozharness,escapewindow/mozharness,mrrrgn/build-mozharness,kartikgupta0909/gittest,mrrrgn/build-mozharness,simar7/build-mozharness,walac/build-mozharness,armenzg/build-mozharness,lissyx/build-mozharness,escapewindow/mozharness,simar7/build-mozharness,kartikgupta0909/mozilla-mozharness,kartikgupta0909/build-mozharness,mozilla/build-mozharness,walac/build-mozharness