detect strictly Chrome downloaded file

git-svn-id: http://svn.redmine.org/redmine/trunk@18532 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/application_system_test_case.rb

@@ -76,7 +76,7 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
         sleep 0.2
       end
     end
-    downloaded_files.first
+    downloaded_files(filename).first
   end
 end