Revert "UMA for result of lock_to_single_user DBus call."

This reverts commit e442952502086a8f8204e8ac3a60a2bb82a7e1e3.

Reason for revert: A chain of reverts is needed in M76, so that a CL is reverted in M75 and then the chain is re-landed in M76 again.

Original change's description:
> UMA for result of lock_to_single_user DBus call.
> 
> If the policy dictates to lock the device to single user, the failure
> to do so generates the user to be logged out. Here we add UMA stats to
> have metrics on how often this happens.
> 
> BUG=b:77799573
> TEST=None
> 
> Change-Id: I5eea6616628c2130f25c746b3ce9cabd63d139a9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1595868
> Commit-Queue: Igor <igorcov@chromium.org>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: Igor <igorcov@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#659955}

TBR=asvitkine@chromium.org,emaxx@chromium.org,igorcov@chromium.org

Change-Id: Iac895f2280dce4e3148b770b1e2e872d16b1fb6c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:77799573
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614161
Reviewed-by: Igor <igorcov@chromium.org>
Commit-Queue: Igor <igorcov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660358}
3 files changed