Question: iPhone 7  

iOS 10.1.1  

Gmail 5.0.3  

Chrome 54.0.2840.91 

When trying to open a link directly within the gmail app, it opens in safari instead of chrome. This used work just fine until the latest update of gmail. 

I looked in the gmail settings under google apps, to use the app instead of the browser. There is no option for Chrome where I imagine it should be. 

I can't find any other option to make chrome the default browser instead of safari. 

Help?

UPDATE: As of 11/26/2016, the problem seems to have been fixed. Links from my gmail app open up in chrome again.

Answer: 
iOS 10 isn't the problem - the "old" gmail app still opened links in chrome well after updating to iOS 10. This didn't become an issue until updating to Gmail's version 5 that this became an issue.
Problem resolved itself by as early as 11/26/2016. 

Gmail: 5.0.7
Chrome: 55.0.2883.79
iOS: 10.1.1