Code review comment for lp:~ahayzen/webbrowser-app/fix-1491279-depend-on-download-manager

It looks like subprocess.run(…) is a recent addition to the subprocess module, it’s not available on my arale’s python3:

phablet@ubuntu-phablet:~$ python3 -c "import subprocess; subprocess.run"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'module' object has no attribute 'run'