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Don't cleanup overlay mapping for non-theme apps
mOverlay structure should keep all app/theme mappings even if the app does not exist. Otherwise we will have to insert back the mapping for every app that is installed which would be time consuming. Without this patch an upgrade app loses its applied theme until the device is rebooted. Change-Id: Id02b8e0a3bdd78d1a9d39cd38294c584ef95f8db