Comment 3 for bug 1719690

We're using Watir from Ruby, which uses Selenium underneath. The way we connect is, essentially:

```
require 'watir'

Watir::Browser.new :chrome
```

This is the error we get from it, which isn't particularly clear:

```
unknown error: Chrome failed to start: exited abnormally
  (Driver info: chromedriver=2.30,platform=Linux 4.4.0-51-generic x86_64) (Selenium::WebDriver::Error::UnknownError)
```