Fix Capybara tests in Chrome 75
Fix Capybara tests in Chrome 75

As described in [1]:

With the release of Chrome 75 (and ChromeDriver 75) we started seeing
this error:

```
Capybara::Chromedriver::Logger::TestHooks.after_example! NoMethodError: private method `log' called for #<Selenium::WebDriver::Remote::W3C::Bridge:0x00007fad79f94218>
```

ChromeDriver 75 now runs in W3C standard compliant mode by default
[2]. Which ultimately means that
`driver.browser.manage.logs.get(:browser)` is not a compliant way to
get access to the logs.

[1] https://github.com/dbalatero/capybara-chromedriver-logger/issues/11

[2] http://chromedriver.chromium.org/downloads

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