This fix enables the Tasks->Java Console menu item to show the Java
Console provided by the JRE plugin if it is installed.
It also exposes nsIJVMManager as a full XPIDL citizen, with the progid
component://netscape/oji/jvm-mgr. see modules/oji/public/nsIJVMManager.idl
for the methods that can be called.
Thanks to Trevor, John Bandauer, Brendan Eich and Robert Yang.
git-svn-id: svn://10.0.0.236/trunk@43214 18797224-902f-48f8-a5cc-f745e15eee43