[9] Code Review Request For 8166933: Clean up private TextAttributes class

[Chien Yang]

Kevin,

Please review the proposed fix. In this fix I also took the chance to 
fix the wildcard import issue in this file:

https://bugs.openjdk.java.net/browse/JDK-8166933
http://cr.openjdk.java.net/~ckyang/JDK-8166933/webrev.00/

Thanks,

- Chien