Cleanup session initializaton in Webrat::Methods

lib/webrat/core/methods.rb

@@ -16,11 +16,11 @@ module Webrat
     end
 
     def webrat_session
-      @_webrat_session ||= ::Webrat::Session.new(webrat_adapter)
+      @_webrat_session ||= begin
+        session = Webrat.session_class.new
+        session.adapter = Webrat.adapter_class.new(self) if session.respond_to?(:adapter=)
+        session
       end
-
-    def webrat_adapter
-      @_webrat_adapter ||= Webrat.adapter_class.new(self)
     end
 
     # all of these methods delegate to the @session, which should

lib/webrat/core/session.rb

@@ -59,6 +59,9 @@ For example:
     extend Forwardable
     include Logging
     include SaveAndOpenPage
+
+    attr_accessor :adapter
+
     attr_reader :current_url
     attr_reader :elements
 
@@ -67,12 +70,11 @@ For example:
       :get, :post, :put, :delete
 
     def initialize(adapter = nil)
+      @adapter         = adapter
       @http_method     = :get
       @data            = {}
       @default_headers = {}
       @custom_headers  = {}
-      @adapter         = adapter
-
       reset
     end