Revert "Use path_names, not resource_path_names, consistently"

Breaks tests on Ruby 1.8.7.
This reverts commit 13bbf98d.

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -372,7 +372,7 @@ def merge_controller_scope(parent, child)
             @scope[:module] ? "#{@scope[:module]}/#{child}" : child
           end
 
-          def merge_path_names_scope(parent, child)
+          def merge_resources_path_names_scope(parent, child)
             merge_options_scope(parent, child)
           end
 
@@ -521,7 +521,7 @@ def member_name
 
         def initialize(*args) #:nodoc:
           super
-          @scope[:path_names] = @set.resources_path_names
+          @scope[:resources_path_names] = @set.resources_path_names
         end
 
         def resource(*resources, &block)
@@ -637,7 +637,7 @@ def match(*args)
             return self
           end
 
-          path_names = options.delete(:path_names)
+          resources_path_names = options.delete(:path_names)
 
           if args.first.is_a?(Symbol)
             action = args.first
@@ -654,7 +654,7 @@ def match(*args)
               end
             else
               with_exclusive_name_prefix(action) do
-                return match("#{action_path(action, path_names)}(.:format)", options.reverse_merge(:to => action))
+                return match("#{action_path(action, resources_path_names)}(.:format)", options.reverse_merge(:to => action))
               end
             end
           end
@@ -682,7 +682,7 @@ def parent_resource #:nodoc:
 
         private
           def action_path(name, path_names = nil)
-            path_names ||= @scope[:path_name]
+            path_names ||= @scope[:resources_path_names]
             path_names[name.to_sym] || name.to_s
           end
 
@@ -693,7 +693,7 @@ def apply_common_behavior_for(method, resources, options, &block)
             end
 
             if path_names = options.delete(:path_names)
-              scope(:path_names => path_names) do
+              scope(:resources_path_names => path_names) do
                 send(method, resources.pop, options, &block)
               end
               return true