Force on_request_exploit override

lib/msf/core/exploit/browser/server.rb

@@ -381,6 +381,7 @@ module Msf
     # @param browser_info [Hash] The target profile
     #
     def on_request_exploit(cli, request, browser_info)
+      raise NoMethodError, "Module must define its own on_request_exploit method"
     end
 
     #