old_contents: # This Source Code Form is subject to the terms of the Mozilla Public
  # License, v. 2.0. If a copy of the MPL was not distributed with this
  # file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
  from cli_update import cli_update
  
  from runtests import cli
  
  from testcases import (FirefoxTestCase,
                         UpdateTestCase,
                         )
  
new_contents: # This Source Code Form is subject to the terms of the Mozilla Public
  # License, v. 2.0. If a copy of the MPL was not distributed with this
  # file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
  from cli_update import cli_update
  from runtests import cli
  
  from testcases import (FirefoxTestCase,
                         UpdateTestCase,
                         )
  
subject: Remove extra line