Prolong PasswordManager.DeleteUndecryptableLoginsReturnValue histogram.

Clearing broken credentials on Mac is a running feature and we want to extend
it at some point to all the Mac users.

Bug: 975450
Change-Id: Id6f087f64017bce2f7287e5a41b6d5005a681211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664712
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670414}
1 file changed