Merge pull request #3252 from avakhov/p-remove-expire_page-dup

Remove unnecessary dup in expire_page

actionpack/lib/action_controller/caching/pages.rb

@@ -122,7 +122,7 @@ def expire_page(options = {})
 
         if options.is_a?(Hash)
           if options[:action].is_a?(Array)
-            options[:action].dup.each do |action|
+            options[:action].each do |action|
               self.class.expire_page(url_for(options.merge(:only_path => true, :action => action)))
             end
           else