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This CL is part of post-launch cleanup for the USS implementation of
wallet_data sync. It removes metrics that are not needed any more.

Bug: 936308
Change-Id: Ifc98ae8e5e34cb8e88774f55e3f788f6c2344f15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1608704
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660350}