Remove the login-times logs from userfeedback reports. BUG=chromium-os:38374 TEST=Send feedback report, confirm that the login-times log is not present. Change-Id: I4441b5f13e8046b32af37554cda88b5b4c0b4f30 Reviewed-on: https://gerrit.chromium.org/gerrit/43062 Reviewed-by: Haixia Shi <[email protected]> Commit-Queue: Rahul Chaturvedi <[email protected]> Reviewed-by: Rahul Chaturvedi <[email protected]> Tested-by: Rahul Chaturvedi <[email protected]>