r = akhil.arora@eng.sun.com, netscape.public.mozilla.java, netscape.public.mozilla.plugins
Added hook for pluglet-engine.
In case there are no handlers for some MIME type this hook would be using.
This fix does not create any dependencies on java-plugin module.
git-svn-id: svn://10.0.0.236/trunk@53617 18797224-902f-48f8-a5cc-f745e15eee43
81c9c905de