Re: [cors-tests] Upload event listeners have to be registered early, always (#3451)

# Firefox #
Testing revision 3669d14b31f17cc295205e5ca7a95988434ed966
Starting 10 test iterations
All results were stable

## All results ##

### /cors/late-upload-events.htm ###
|           Subtest            | Results |
|------------------------------|---------|
|                              | OK      |
| Late listeners: Preflight    | PASS    |
| Late listeners: No preflight | PASS    |

View on GitHub: https://github.com/w3c/web-platform-tests/pull/3451#issuecomment-256436573

Received on Wednesday, 26 October 2016 18:29:14 UTC