How to disable 'This type of file can harm your computer' pop up

The problem with XML files started to happen to me as of Chrome 47.0.2526.80 m. After spending maybe 6 hours trying to turn off every possible security option I tried a different approach.

Ironically, it seems that turning on the Chrome option "Protect you and your device from dangerous sites" removes the message "This type of file can harm your computer. Do you want to keep file.xml anyway?"

I am using 'Ruby' with 'Watir-Webdriver' where the code looks like this:

prefs = {
    'safebrowsing' => {
        'enabled' => true,
    }
}

b = Watir::Browser.new :chrome, :prefs => prefs

Starting the browser like this, with safebrowsing option enabled, downloads the xml files without the message warning. The principle should be the same for Selenium with any programming language.

##### Edited: 13-04-2017

In latest version of Google Chrome the above solution is not enough. Additionally, it is necessary to start the browser with the following switch:

--safebrowsing-disable-download-protection

Now, the code for starting the browser would look something like this:

b = Watir::Browser.new :chrome, :prefs => prefs, :switches => %w[--safebrowsing-disable-download-protection]))

I am posting below the complete code that got file download working for me: Hope it helps :-) I am using Java-Selenium

System.setProperty("webdriver.chrome.driver", "C:/chromedriver/chromedriver.exe");
        String downloadFilepath = "D:/MyDeskDownload";
        HashMap<String, Object> chromePrefs = new HashMap<String, Object>();
        chromePrefs.put("profile.default_content_settings.popups", 0);
        chromePrefs.put("download.default_directory", downloadFilepath);
        chromePrefs.put("safebrowsing.enabled", "true"); 
        ChromeOptions options = new ChromeOptions();
        options.setExperimentalOption("prefs", chromePrefs);
        DesiredCapabilities cap = DesiredCapabilities.chrome();
        cap.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
        cap.setCapability(ChromeOptions.CAPABILITY, options);
        WebDriver driver = new ChromeDriver(cap);