[before-prepare-iframe-fetch-error-external-classic.html]
  [<script> error: Move fetch-error external classic script to iframe before-prepare]
    expected:
      if (os == "linux") and not debug and not fission: [PASS, FAIL]
      if (os == "linux") and not debug and fission: [PASS, FAIL]
      if (os == "linux") and debug: [PASS, FAIL]
      if os == "mac": [PASS, FAIL]
