Expose validate_back_url as helper method (#32850).

Patch by Holger Just.

git-svn-id: http://svn.redmine.org/redmine/trunk@19487 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/application_controller.rb

@@ -480,11 +480,13 @@ class ApplicationController < ActionController::Base
     return path
   end
   private :validate_back_url
+  helper_method :validate_back_url
 
   def valid_back_url?(back_url)
     !!validate_back_url(back_url)
   end
   private :valid_back_url?
+  helper_method :valid_back_url?
 
   # Redirects to the request referer if present, redirects to args or call block otherwise.
   def redirect_to_referer_or(*args, &block)