Fix the dictionary attack count metric.

The previous version sent the enum value in the form '0x05' which is
interpreted by metrics_client as 0.

BUG=chromium:341358
TEST=manual

Change-Id: I87743eb129223099f8b1a9b259a2f7c5eaf8fa60
Reviewed-on: https://chromium-review.googlesource.com/191728
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Tested-by: Darren Krahn <dkrahn@chromium.org>
Commit-Queue: Darren Krahn <dkrahn@chromium.org>
1 file changed