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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}