Merge "Throw UnsupportedOperationException when creating ephemeral user on a...

        Preconditions.checkNotNull(who, "ComponentName is null");

        // Allow setting this policy to true only if there is a split system user.

        if (forceEphemeralUsers && !mInjector.userManagerIsSplitSystemUser()) {

            throw new IllegalArgumentException(

            throw new UnsupportedOperationException(

                    "Cannot force ephemeral users on systems without split system user.");

        }

        boolean removeAllUsers = false;