RFR [14]: 8225802: Remove unused CSS classes from HTML doclet

[Hannes Wallnöfer]

Please review:

JBS: https://bugs.openjdk.java.net/browse/JDK-8225802
Webrev: http://cr.openjdk.java.net/~hannesw/8225802/webrev.00/

There are quite a few HtmlStyle values and CSS classes that are not used anymore. I grepped the generated docs for the removed classes and didn’t find any occurrences. Mach5 tier 1 tests do pass.

Thanks,
Hannes