asynctypes-685526: Change key names for l10n

Localizers need changed key names so they know to re-translate. We
changed some values without changing the keys names, so this patch
just updates the key names.

Signed-off-by: Joe Walker <jwalker@mozilla.com>
asynctypes-685526: helpers tidy-up after run

2 changes:
- Add options.document because it's just as useful as options.window
  and it's hard to remember which is available
- Remove the properties added when the test has run.

Signed-off-by: Joe Walker <jwalker@mozilla.com>