Pass named argument 'default_parameters' to fix test_with_parameters in_file_unittest.py

This test case is failing as default_parameters is defaulted to 'None' due to its position
after valid_values. Passing it as named argument fixes the failing case.

Review URL: https://codereview.chromium.org/397593002

git-svn-id: svn://svn.chromium.org/blink/trunk@178212 bbb929c8-8fbe-4397-9dbb-9b2b20218538