Fix flaky AntivirusMetricsProvider unit tests

It is unknown when, but an update to Windows 10 changed the name
of Windows Defender to Windows Defender Antivirus.

Bug: 682286
Change-Id: I3202896859fd3018d276dc1f30f1704e67c6d6d5
Reviewed-on: https://chromium-review.googlesource.com/c/1432092
Reviewed-by: Robert Kaplow <[email protected]>
Reviewed-by: Will Harris <[email protected]>
Commit-Queue: Patrick Monette <[email protected]>
Cr-Commit-Position: refs/heads/master@{#626152}
1 file changed