GitLab

Delete unused SuggsetionsMetrics methods and mark corresponding
user actions as obsolete.

BUG=

Change-Id: I2c9d43d517ed03162dbe5fa051639a0cc342846a
Reviewed-on: https://chromium-review.googlesource.com/1162316Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580642}