Replace expression closures (command/option/mapping definitions).

Expression closures are to be axed. See https://bugzil.la/1083458.

common/modules/javascript.jsm

@@ -860,7 +860,9 @@ var JavaScript = Module("javascript", {
             }, {
                 argCount: "?",
                 bang: true,
-                completer: function (context) modules.completion.javascript(context),
+                completer: function (context) {
+                    modules.completion.javascript(context);
+                },
                 hereDoc: true,
                 literal: 0
             });