Steps to reproduce the problem:
1. On Android, go to https://www.krang.org.uk/misc/sameSiteCookies/
2. Scroll down to test 6
3. Follow the download link, and note that you don't get a PDF.

What is the expected behavior?

What went wrong?
Two requests are being made to download this file (not good in itself), and the second request does not include the SameSite cookies.

Did this work before? N/A 

Chrome version: 51.0.2704.81  Channel: stable
OS Version: 5.1
Flash Version: 

This is related to Issue 626242 (https://crbug.com/626242).

Apache Logs:

[2016-07-27 14:49:27] "GET /misc/sameSiteCookies/?output=pdf&disposition=attachment&require=true HTTP/1.1" 200 4754 "https://www.krang.org.uk/misc/sameSiteCookies/" "Mozilla/5.0 (Linux; Android 5.0.1; GT-I9500 Build/LRX22C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.81 Mobile Safari/537.36"

[2016-07-27 14:49:27] "GET /misc/sameSiteCookies/?output=pdf&disposition=attachment&require=true HTTP/1.1" 200 21 "https://www.krang.org.uk/misc/sameSiteCookies/" "Mozilla/5.0 (Linux; Android 5.0.1; GT-I9500 Build/LRX22C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.81 Mobile Safari/537.36"