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This reverts commit 1ca3c153.

Reason for revert:
Needed to land parent CL revert: https://chromium-review.googlesource.com/c/chromium/src/+/2567511

Original change's description:
> Add WebApp.Preinstalled.UninstallAndReplaceCount UMA histogram
>
> This CL adds metrics for how often preinstalled web apps migrate and
> remove an existing app install.
>
> This data is useful to monitor rollouts of default web apps that are
> replacing old Chrome apps to ensure the migration is happening as
> expected.
>
> Bug: 809304, 1058265
> Change-Id: Ie9edb4a1cf89e84d7e56a20bad028dd8ea1aeb07
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561999
> Commit-Queue: Alan Cutter <alancutter@chromium.org>
> Reviewed-by: Glen Robertson <glenrob@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#832148}

TBR=rkaplow@chromium.org,alancutter@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,glenrob@chromium.org

Change-Id: I46c1a678e09111d210d1385bdb17ecc4fcabb093
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 809304
Bug: 1058265
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567056Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832227}