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.
76832ecb8b