UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. Tap on a link containing a 'download' atrribute with: 
Content-Type:application/pdf AND Content-Disposition:attachment; filename="[my-file-name].pdf"

2. File will not download

3. Testing further in JavaScript: window.alert(typeof a.download === 'undefined') returns `true`. Hm. In Desktop for Mac version 50+ it is `false`

What is the expected behavior?
The download should initiate and ask which app I want to use to save the file (i.e. Dropbox, Google Drive)

What went wrong?
The download never starts. No visible error, no crash.

Did this work before? Yes 

Chrome version: 50.0.2661.86  Channel: stable
OS Version: OS X 10.11.3
Flash Version: Shockwave Flash 21.0 r0