Traceback (most recent call last):
  File "/tmp/adt-run.Q8fegM/build.1rP/real-tree/ubuntu_system_tests/tests/test_with_webbrowser.py", line 304, in test_unsimplify_url_in_address_bar
    driver = setup_webdriver()
  File "/tmp/adt-run.Q8fegM/build.1rP/real-tree/ubuntu_system_tests/helpers/webapp/__init__.py", line 58, in setup_webdriver
    chrome_options=options)
  File "/tmp/adt-run.Q8fegM/deps/usr/lib/python3/dist-packages/selenium/webdriver/chrome/webdriver.py", line 65, in __init__
    keep_alive=True)
  File "/tmp/adt-run.Q8fegM/deps/usr/lib/python3/dist-packages/selenium/webdriver/remote/webdriver.py", line 73, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/tmp/adt-run.Q8fegM/deps/usr/lib/python3/dist-packages/selenium/webdriver/remote/webdriver.py", line 121, in start_session
    'desiredCapabilities': desired_capabilities,
  File "/tmp/adt-run.Q8fegM/deps/usr/lib/python3/dist-packages/selenium/webdriver/remote/webdriver.py", line 173, in execute
    self.error_handler.check_response(response)
  File "/tmp/adt-run.Q8fegM/deps/usr/lib/python3/dist-packages/selenium/webdriver/remote/errorhandler.py", line 166, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at 127.0.0.1:9221
from chrome not reachable
  (Driver info: chromedriver=2.16,platform=Linux 3.10.35+ armv7l)

}}}