Re: [navigation-timing-tests] Fix PerformanceNavigationTiming accessor behavior after document detach. (#5254)

This looks like an infra failure:

```
u'runner_teardown' ()
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/wptrunner/testrunner.py", line 142, in start_runner
    executor = executor_cls(browser, **executor_kwargs)
  File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/wptrunner/executors/executormarionette.py", line 560, in __init__
    self.do_delayed_imports()
  File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/wptrunner/executors/executormarionette.py", line 598, in do_delayed_imports
    from . import pytestrunner
  File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/wptrunner/executors/pytestrunner/__init__.py", line 5, in <module>
    from . import fixtures
ImportError: cannot import name fixtures
```

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5254#issuecomment-290478478

Received on Thursday, 30 March 2017 17:13:19 UTC