UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
1. Use the Linux version
2. Disable the Chrome PDF viewer in Settings -> Content Settings -> "Open PDF files in the default viewer application"
3. Ensure "Ask where to save file before downloading" is ticked.
4. Ensure you click "Clea auto-opening settings"
5. Go to any website and click on a PDF link

What is the expected behavior?
Chrome should ask me where to download the file and save it there

What went wrong?
Chrome automatically downloads the files and OPENS it. This is a MASSIVE SECURITY HOLE if the link is malicious.

If I right click "Save link as..." then I'm allowed to chose where to download the file, but it will still open it after it's done.

Did this work before? Yes Chrome 54 or 55 I think

Chrome version: 56.0.2924.87  Channel: stable
OS Version: 16.04
Flash Version: Shockwave Flash 24.0 r0