Changing unit test case to verify account selection dialog is disabled.

        // Remove the default account to emulate broken preferences.

        mTarget.removeDefaultAccountForTest();

        assertTrue(mTarget.shouldShowAccountChangedNotification());

        // The dialog shouldn't show up.

        // The logic is, if there's a writable account, we'll pick it as default

        assertFalse(mTarget.shouldShowAccountChangedNotification());

    }

    private static <T> Set<T> toSet(Collection<T> collection) {