Remove temporary crutch to help ApplicationController be unloaded. Cl…

…oses #6496.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5454 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/dispatcher.rb

@@ -101,7 +101,7 @@ def prepare_application
         end
 
         prepare_breakpoint
-        Dependencies.require_or_load('application.rb', "ApplicationController") unless Object.const_defined?(:ApplicationController)
+        Dependencies.require_or_load('application') unless Object.const_defined?(:ApplicationController)
         ActiveRecord::Base.verify_active_connections! if defined?(ActiveRecord)
         run_preparation_callbacks
       end