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This allows caller for OsIntegrationManager::UninstallOsHooks to pass
callback to check the result of the uninstallation of all OS hooks.

Bug: 1108109
Change-Id: I87c3369f9264bdd2cbc4014fd7dc45baef493cdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329948
Commit-Queue: Phillis Tang <phillis@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794759}