RFR(S): 8244668: Remove SA's javascript support

[Chris Plummer]

Hello,

Please review the following changes to fully remove javascript support 
from SA. It's been non-functional since JDK 9 and there are no plans to 
support it anymore.

https://bugs.openjdk.java.net/browse/JDK-8244668
http://cr.openjdk.java.net/~cjplummer/8244668/webrev.00/index.html

If anyone thinks a CSR is needed for this, please let me know. There's 
no spec involved. The support was always pretty ad hoc, with some 
supporting documentation in the source tree in jsdb.html [1], but which 
doesn't appear itself to have ever been released.

There was one menu item in the hsdb GUI that used javascript (and as a 
result caused an exception). I was having a little trouble deciphering 
what it actually does, but it appears to allow you to write some 
javascript to produce (and filter) a list of objects, and then display 
the list of objects in a window where you could inspect them further. 
Since there is no way to do something similar in java without allowing 
the user to provide hsdb extensions in the form of .class files (or 
support writing and compiling java classes from within hsdb), I just 
removed the hsdb feature by removing the menu item and supporting code.

thanks,

Chris

[1] 
https://hg.openjdk.java.net/jdk/jdk/raw-file/a7e42c260029/src/jdk.hotspot.agent/doc/jsdb.html