Remove unused params.

Author: Jerry Tao

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -1904,7 +1904,7 @@ def add_route(action, controller, options, _path, to, via, formatted, anchor, op
             ast = Journey::Parser.parse path
 
             mapping = Mapping.build(@scope, @set, ast, controller, default_action, to, via, formatted, options_constraints, anchor, options)
-            @set.add_route(mapping, ast, as, anchor)
+            @set.add_route(mapping, as)
           end
 
           def match_root_route(options)

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -565,7 +565,7 @@ def empty?
         routes.empty?
       end
 
-      def add_route(mapping, path_ast, name, anchor)
+      def add_route(mapping, name)
         raise ArgumentError, "Invalid route name: '#{name}'" unless name.blank? || name.to_s.match(/^[_a-z]\w*$/i)
 
         if name && named_routes[name]