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This is a reland of e15311e1

Original change's description:
> Deprecate uninstall_metrics.
>
> Remove the tracking/persisting of these metrics in prefs. Removed
> uploading in uninstaller.
>
> Bug: 1107516
> Change-Id: I84499820cea86b5f785949d9274e8b2205714aae
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308133
> Reviewed-by: Tommy Li <tommycli@chromium.org>
> Reviewed-by: Nate Fischer <ntfschr@chromium.org>
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825461}

Bug: 1107516
Change-Id: Id7a71c3b8d64dbe9984b2f7f33808207071550f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528581Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826222}