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This moves AppshortcutManager::DeleteSharedAppShims to OsIntegrationManager
and also removes observing of |OnWebAppProfileWillBeDeleted| from
shortcut manager and filehandler manager, instead makes registrar
call |OsIntegrationManager::UnisntallOsHooks| on profile being deleted.

Bug: 1098027
Change-Id: I629126d7661e2fdbbaff8645a46382d59c93dca9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320997Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792734}