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This is a reland of d3cc95bb

Original change's description:
> [WebAppProvider] Test OS hook uninstallation calls & completion logic.
>
> This patch adds the virtual methods to the uninstallation path, and adds
> corresponding tests for those in the unittests file.
>
> R=phillis@chromium.org
>
> Change-Id: I316145e6030d16ff3a28bf7fecb3d2cdbac940d4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545864
> Commit-Queue: Daniel Murphy <dmurph@chromium.org>
> Reviewed-by: Phillis Tang <phillis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#832087}

Change-Id: Ie95af999acb33e2970dd2b9350ff9316cf6f7af5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567820
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Phillis Tang <phillis@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832547}