Drop request class from RouteSet constructor.

If you would like to use a custom request class, please subclass and implemet
the `request_class` method.

actionpack/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Drop request class from RouteSet constructor.
+ 
+    If you would like to use a custom request class, please subclass and implemet
+    the `request_class` method.
+
+    *tenderlove@ruby-lang.org*
+
 *   Fallback to `ENV['RAILS_RELATIVE_URL_ROOT']` in `url_for`.
 
     Fixed an issue where the `RAILS_RELATIVE_URL_ROOT` environment variable is not

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -311,7 +311,7 @@ def define_url_helper(mod, route, name, opts, route_key, url_strategy)
 
       attr_accessor :formatter, :set, :named_routes, :default_scope, :router
       attr_accessor :disable_clear_and_finalize, :resources_path_names
-      attr_accessor :default_url_options, :request_class
+      attr_accessor :default_url_options
       attr_reader :env_key
 
       alias :routes :set
@@ -320,11 +320,10 @@ def self.default_resources_path_names
         { :new => 'new', :edit => 'edit' }
       end
 
-      def initialize(request_class = ActionDispatch::Request)
+      def initialize
         self.named_routes = NamedRouteCollection.new
         self.resources_path_names = self.class.default_resources_path_names
         self.default_url_options = {}
-        self.request_class = request_class
 
         @append                     = []
         @prepend                    = []
@@ -337,6 +336,10 @@ def initialize(request_class = ActionDispatch::Request)
         @formatter = Journey::Formatter.new @set
       end
 
+      def request_class
+        ActionDispatch::Request
+      end
+
       def draw(&block)
         clear! unless @disable_clear_and_finalize
         eval_block(block)
@@ -545,7 +548,7 @@ def build_conditions(current_conditions, path_values)
 
         conditions.keep_if do |k, _|
           k == :action || k == :controller || k == :required_defaults ||
-            @request_class.public_method_defined?(k) || path_values.include?(k)
+            request_class.public_method_defined?(k) || path_values.include?(k)
         end
       end
       private :build_conditions

actionpack/test/dispatch/routing_test.rb

@@ -3583,7 +3583,11 @@ def call(env)
     end
   end
 
-  AltRoutes = ActionDispatch::Routing::RouteSet.new(AltRequest)
+  AltRoutes = Class.new(ActionDispatch::Routing::RouteSet) {
+    def request_class
+      AltRequest
+    end
+  }.new
   AltRoutes.draw do
     get "/" => TestAltApp::XHeader.new, :constraints => {:x_header => /HEADER/}
     get "/" => TestAltApp::AltApp.new