shell, apps: Improve MMManager storage in CcObjectStorage
It's more convenient to define another string to use to store an MMManager in CcObjectStorage.
Also, Default Apps leaks an MMManager if it is configured to use it, so clean that up too.
It's more convenient to define another string to use to store an MMManager in CcObjectStorage.
Also, Default Apps leaks an MMManager if it is configured to use it, so clean that up too.